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GitHub COO Kyle Daigle joins swyx to map what the agent era looks like from inside the platform hosting 200 million developers and now processing commits at 14x last year's pace. Across 84 minutes they cover how Kyle runs GitHub with AI-driven micro-skills and WorkIQ MCP, why former developers in leadership have an unusual edge right now, the full arc of GitHub's platform history from webhooks to Actions to Copilot, and where trust in agent-generated code ultimately has to come from. The conversation is grounded throughout in Kyle's own weekend and executive workflows: building AI-generated revenue presentations, running 15 simultaneous agents on a Saturday, and describing what "ambient AI" would actually need to do before it becomes genuinely useful. ## [00:00] Hook Kyle opens mid-sentence, already deep in his argument: people who detoured into other careers before coding, and came back armed with cross-domain knowledge, are uniquely positioned in the AI era. Running 15 agents on a Saturday while his kids are at lacrosse is not just a productivity flex — it recreates the feeling of creation that got him into software in the first place. > *"I can crank up 15 agents on Saturday, you know, while my kids are doing lacrosse. That's like really powerful and I think it gets me back to that feeling of like creation."* ## [01:21] Introduction Kyle's title is COO of GitHub, but he recently took on CMO of Developer for Microsoft as well — meaning every developer-facing product and communication across the broader Microsoft ecosystem now runs through him. He's been at GitHub for 13 years, joined as a developer, personally built webhooks and the platform/API layer, ran engineering until 2018, then moved into the operational and business side. The dual COO/CMO role is unusual; Kyle frames it as the same job with a larger surface area: tell the truth, be authentic, let the products speak. > *"I built webhooks and worked with teams building the API, built the platform layer, anything that integrated with GitHub, up until really 2018 I built or ran the engineering teams."* ## [04:57] Why AI Got Kyle Coding Again Swyx points out that Kyle's commit graph shows a clear dip through his leadership years and a sharp uptick recently — entirely driven by AI. Kyle is not writing features for GitHub's product; he's building internal agents and workflow tools that stitch together disparate data sources. His primary use case is retrospective: using WorkIQ, MCP servers, Slack, Teams transcripts, and Obsidian notes to ask "what actually happened last week, what worked, and what should I tweak for the next few days." He finds LLMs are exceptionally good at pattern-finding across a week of context, far more so than generating forward-looking plans from scratch. > *"I find AI in like what most of this launch here is actually like less building forward. It's actually like a recursive loop backwards. I'm always looking at what had happened first."* ## [08:25] Running GitHub with AI: WorkIQ, MCP, Slack, Teams, and Skills GitHub rolled out AI internally by meeting people where they already work — Slack, Teams, email — rather than forcing them onto a new tool. Every employee, technical or not, gets the Copilot CLI plus a shared set of atomic micro-skills deposited into repos. The era of the "mega-skill" that handles an entire workflow end-to-end is over; what works are tiny, single-purpose skills that do one thing well and compose cleanly. Kyle uses Postel's Law as a design principle: liberal in what each skill accepts, strict in what it outputs. WorkIQ, the M365 MCP server, lets anyone ask backward-facing questions across every meeting, email, and chat — critical for a fully remote, globally distributed team. > *"We're ending the era of these like massive beautiful perfect skills. What we found is these incredibly micro skills that are just doing one thing for us very very well versus a skill that's going to do that full report that doesn't really exist on our side anymore."* ## [17:00] The Golden Age for Former Developers in Leadership Swyx asks whether people like Kyle — technical backgrounds, now in exec roles — have a structural advantage in the AI era. Kyle's answer: pattern-finding and problem-solving are the durable skills from his developer years, and AI has given him back the ability to apply them directly in code. The more interesting case isn't developers going back to update old side projects; it's people who spent ten-plus years accumulating business knowledge now using that context as leverage when wielding AI tools. The cross-domain background, once a liability in pure engineering orgs, is now a multiplier. > *"I just find that the folks that came from a different career, went to school for something else, went off and did this random thing and then became a software dev — now having the power of an AI where I can crank up 15 agents on Saturday."* ## [18:52] 15 Agents on Saturday and AI-Generated Executive Work Kyle built GitHub's annual revenue planning presentation entirely with AI — a SQLite app to view the data, skills pulling from Obsidian notes and work context, and a deliberate skill that made the output look "humanly bad" so it wouldn't read as AI-generated. He presented it to the CRO and CFO teams without disclosing the process; nobody asked. His point isn't to hide AI from colleagues but to demonstrate that value is in crafting and judgment, not slide assembly. The ability to build a small data-manipulation app and control the final output is, specifically, the advantage that developers carry into leadership. > *"I ultimately built this entire presentation without touching any of it. And I was like, okay, I'm just going to present this to our CRO, the CFO, their teams without mentioning I built it with AI. Never came up once."* ## [21:41] How AI Changes the Chief of Staff Role Kyle still has a chief of staff — but the job has shifted. Slide prep and presentation assembly have moved to AI; what remains irreplaceable is the human connective tissue: knowing which people in which cities should meet, surfacing relationship opportunities across a distributed org, brokering conversations that don't appear in any MCP server. The analogy is email replacing letter-opening: nobody expects the chief of staff to open physical mail anymore, and soon nobody will expect them to build decks either. The judgment about *who* should talk to *whom* is what stays. > *"I still have a chief of staff because the difference is the human connection aspects — I should be meeting with this group and this team and they have an opportunity and I'm going to be in San Francisco today."* ## [23:06] GitHub's History: Actions, npm, Webhooks, and Open Source Kyle walked the platform's architectural history: GitHub Services (pre-2014 arbitrary Ruby execution with no real containerization), webhooks, Pages, and then Actions — launched by Kyle personally at GitHub Universe in October 2018. Actions went from "we should not be running arbitrary Ruby on people's behalf" to a fully containerized compute layer now using Azure Dev Compute for fast, small-VM agent spin-ups. The npm acquisition came from a simple premise: npm was powering the internet and having scaling problems; GitHub's job was to keep it running and raise its security posture. Every security improvement — 2FA enforcement, token invalidation on exposure — breaks something downstream, and that balance between hardening a 15-year-old ecosystem and not causing developer snow days remains the central tension. > *"We have changed the 2FA policies, we've changed the way the tokens work. When we find tokens that have been exposed or potentially exposed, we invalidate them. That creates issues. But we're trying to push the community forward."* ## [30:06] Slop Forks, Vendoring, and AI Dependency Management Swyx raises the "slop fork" pattern — AI-assisted vendoring where you pull in only the source you need rather than importing a whole package — and asks whether it sidesteps npm's vulnerability surface. Kyle: vendoring was how everyone worked in 2013, and there's something true about pulling in only what you need, but it doesn't fix the fundamental problem. An agent evaluating code can be convinced it's secure just as easily as a human can. Static analysis and runtime testing still need investment regardless of package scope. GitHub's historical stance — wait for community RFC and social consensus before cementing a practice — means they won't push a single vendoring standard, but will build tools for maintainers to enforce their own trust rules. > *"The vulnerabilities — in an agent looking at them there's time and time again a million different ways in which we can convince an agent that this thing is like secure or not."* ## [35:18] Pull Requests, Prompt Requests, and Trust in Agent-Generated Code GitHub invented the pull request as a social trust mechanism, and now agents are generating the majority of PRs on many projects. Kyle assessed various alternatives — Peter Coppola's "prompt request" model, Thomas Dohmke's contribution-asset approach — but argues that none fully solve the underlying problem: trust is social, not technical. Even if a PR is 100% verified by static analysis, humans still reach for human signals (does Mitchell approve it?) before merging. GitHub's current direction centers on giving maintainers malleable tools to define their own trust heuristics rather than imposing a universal standard, because any single standard immediately becomes a gamification target. The endgame is something closer to human digital identity. > *"The reason why there's not a single answer is ultimately we're trying to codify trust. Right now when an agent writes code and another agent reviews code and then Kyle goes and looks at it, the trust is kind of diffuse."* ## [42:42] GitHub Stars, 200M+ Developers, and the New AI Builder Wave GitHub crossed 200 million accounts — up from 80 million not long ago. The rapid star accumulation on new AI projects is mostly genuine: an entire new cohort who built their first app in the AI era is swarming the zeitgeist. Kyle refuses to split hairs about who "counts" as a developer, drawing on his own experience being called a fraud for having a GitHub account before he knew what git was. The gamification problem is real (whack-a-mole anti-abuse, now AI-powered), but the majority of the star velocity is new builders who want to participate in the moment the way Kyle wanted to participate in the Ruby era. > *"It's not just developers. It's folks that have maybe started coding or only joined in since the AI era. And those projects are going up because you want to be a part of this moment."* ## [46:36] GitHub Spark, Low-Code, and Why GitHub Still Shows the Code GitHub experimented with Spark as an easy app-build-and-run experience. The lesson: for developers, the value was always simple runtime, not a UI veneer hiding the code. GitHub's architectural principle is non-negotiable — they will always show you the code. The broader goal Kyle articulates is lowering the barrier to that first "I had an idea and I built it" moment: anyone should be able to swap a light switch without needing to open the breaker box. > *"Anytime we try to put a veneer on top of something, we still always show you the code. That's kind of like a tenant. We're never gonna hide the code from you ever."* ## [48:59] GitHub's Hardest Era: 14x Growth, Reliability, and Scale GitHub went from 1 billion commits in all of 2025 to 275 million per week in April 2026 — a 14x year-on-year rate still accelerating. This broke things in new ways: not the old webhooks reliability problems (those were fixed and rewrote), but novel permission-layer failures only visible at cross-object scale. The core pain point is MySQL 1, a monolithic permissions database GitHub has been decomposing for years; permissioning is where most cross-cutting outages originate. Simultaneously, the industry is shifting back toward monorepos, which carry unique git infrastructure performance characteristics. Kyle frames the scaling problem as "diagonal" — vertical and horizontal both stop working, so you crack open services running unchanged for 10-15 years and rewrite them. > *"We're doing more in a month than we did in a year last year. By roughly every measure, there's growth that is much much bigger. And that is breaking our system in new ways, not old ways."* ## [60:42] Actions as the Compute Layer for CI/CD and Automation Actions has evolved well beyond CI/CD into a general-purpose automation compute layer — the root of significant availability pressure because every agent task and agentic workflow translates into more builds and more CPU. GitHub is expanding compute through both its own data centers and Azure cloud, and is using Azure Dev Compute (fast small-VM spin-up) under the hood for containerized agent execution. The path to fewer outages is a step-change model: large foundational infrastructure fixes that take time, then visible plateau improvements in availability rather than incremental noise reduction. > *"Actions is the core compute layer for either CI or side project. More tools, more agents, more PRs mean more builds. More builds need more CPUs and we simply need more CPUs."* ## [63:25] The State and Future of GitHub Copilot Copilot's history: launched as code completion, then shifted energy toward fine-tuning as the industry demanded better accuracy, and then next-gen models arrived and made fine-tuning less critical — creating confusion about where Copilot was going. The current architecture unifies a single SDK and agent harness across code completion, the new CLI, the new desktop app, and cloud agents. The future Kyle describes covers the full SDLC: security remediation, issue triage, documentation drift detection — not just writing code. The remaining hard problem is context and memory: getting GitHub to "act like Kyle wants it to act" across all his dependencies, preferences, and team context. > *"What we think is that it's not solely about the code generation. It's really about having the ability to use these coding agent brained harnesses across not just the coding experience but also security remediation, every GitHub issue that comes in."* ## [69:45] Ambient AI, Background Agents, and the Future of the SDLC Kyle argues the industry is still stuck in a "hyper-myopic" frame where coding agents only know about code. What he actually wants is ambient AI that carries every spec doc, every email thread, every conversation, every Obsidian note into its decision-making as a developer — not as a recall tool you query, but as persistent background context that shapes implementation choices in real time. OpenClaw interests him precisely because it connects personal context to agent action; but the missing piece is making that context available *during* software development. The extreme version — AI that proactively directs you rather than waiting to be asked — is the inversion of control that both excites and slightly alarms him. > *"The most interesting thing to me in AI is actual ambient AI. I'm looking to be implementing a new feature and for it to know every spec doc, every email, the conversations that I've had online, everything about how this could be implemented and be able to use that as part of its decision-making."* ## [74:30] OpenClaw, Enterprise Security, and the New OS for Agents Microsoft has a CVP dedicated to OpenClaw — unusual given Microsoft doesn't own Anthropic. Kyle explains: OpenClaw demonstrated what a valuable personal agent actually looks like (full personal context, computer use, not just chat), and Microsoft's job is to make that work in enterprise — OS-level sandboxing on Windows so you can run an agent on a work device without it becoming a security incident. The framing Kyle reaches for: Microsoft is the original operating systems company, and agents need a new OS layer. Workloads have changed so fundamentally that the right question is no longer "do we need more inference?" but "what type of compute do we need to run these agentic flows?" — all the way down to silicon. > *"Microsoft is the original operating systems company and here's the new operating system for AI. Operating systems need to look different than they looked five years ago because it's not just you using them anymore."* ## [79:24] Build Announcements, WorkIQ, FoundryIQ, and Microsoft Context Kyle previews what GitHub and Microsoft are announcing at Build: WorkIQ (M365 context engine via MCP, powerful for retrospective questioning across all work assets) and FoundryIQ (same intelligence layer that connects to existing data stores without requiring migration). The pitch for enterprise developers: "how I build on the weekend should be how I build at work" — but Fortune 500 companies can't just vibe-code and ship; security and compliance gates have to move as fast as development does. WorkIQ and FoundryIQ are the attempt to bring weekend-level agility into the enterprise context layer, with the governance that lets it survive in large organizations. > *"Work IQ, Foundry IQ — these context engines are wild good and we've given them to our developers at GitHub. You can ask questions around everything in your work context and it's surprisingly powerful."* ## [83:02] What Should swyx Ask Satya? swyx is about to interview Satya Nadella at Build and asks Kyle what to ask. Kyle's recommendation: challenge Satya on what he believes is demonstrably true about the AI and inference landscape in two to three years — not as a throwaway futurist question, but as a direct test of the internal bets Microsoft is making right now. Significant external skepticism exists about Microsoft's AI approach, and a straight answer from Satya would be both a genuine stress test and a reassuring signal for the developer community. > *"The best question to ask is what he thinks is true in like two or three years from now. The way that he is looking at this AI problem, the inference problem, the token problem — why is this approach in two years going to pay off?"* ## Entities - **Kyle Daigle** (Person): COO of GitHub and CMO of Developer for Microsoft; 13-year GitHub veteran who built the original webhooks and platform API layer. - **swyx** (Person): Host of Latent Space podcast; developer-advocate-turned-podcaster who conducted this interview at Microsoft Build 2026. - **GitHub Copilot** (Software): GitHub's AI coding assistant, now spanning code completion, CLI, desktop app, and cloud agents under a unified SDK. - **WorkIQ** (Software): Microsoft 365 MCP server that gives employees a context engine over all work assets (Teams, email, calendar, etc.). - **FoundryIQ** (Software): M365 intelligence layer that connects to existing enterprise data stores without requiring migration. - **GitHub Actions** (Software): GitHub's general-purpose compute and CI/CD automation layer; primary source of CPU demand growth from agent workloads. - **OpenClaw** (Software): Anthropic's Claude Code agentic tool; referenced as a model for what a personal AI agent with full context and computer use looks like. - **npm** (Software): JavaScript package registry acquired by GitHub; central to supply-chain security discussions about vendoring, slop forks, and dependency trust. - **Mitch Hashimoto** (Person): Co-founder of HashiCorp, active open-source maintainer; discussed in context of vendoring approaches and GitHub's maintainer relationship model. - **Thomas Dohmke** (Person): CEO of GitHub; referenced in context of PR workflow evolution. - **Microsoft Build** (Organization): Annual Microsoft developer conference; context for this episode's release and Kyle's expanded-role announcements.

Ethan He built NVIDIA's Cosmos world model, then joined xAI mid-2025 to build Grok Imagine from scratch — no infra, no data, no model — and shipped the first audio-video generation model in three months. He walks swyx and Vibhu through the full technical stack: synthetic captioning pipelines, VAE design tradeoffs, step distillation, audio-video alignment, and the hard economics of storing petabytes of video training data. His central argument runs through the entire conversation: since diffusion model technology has largely matured, most quality gains in video now come from language models, not from the video model itself — a view with direct implications for where the field goes next, including video agents, generative UI, and embodied world models. ## [00:00] Hook This exchange — Ethan's "pretty big claim" that visual intelligence now mostly comes from language — is pulled from later in the interview, where he argues that improvements to video models are increasingly driven by better language models acting as prompt rewriters and orchestrators, not by advances in diffusion or flow-matching architectures themselves. > *"Every time you see there's some improvement on these models, I would say mostly the gain comes from language model, not coming from the video model itself."* ## [01:16] Introduction swyx and Vibhu welcome Ethan to the Latent Space studio, noting he has been a recurring presence through the podcast's paper club — first presenting the Cosmos world model paper, then mixture-of-experts work. The conversation opens with a brief aside about the Poolside paper released the same day, a fully open Gemma-level model trained on 40 trillion tokens, before pivoting to Ethan's own trajectory. ## [02:41] From NVIDIA Cosmos to xAI Ethan built Cosmos — NVIDIA's giant video foundation model aimed at giving roboticists a simulatable world to build on — and shipped it by end of 2024. Once he realized video models obeyed the same scaling laws as language models, he went looking for more compute. xAI offered it. He joined in mid-2025 at the moment xAI decided to build its own image and video stack, with no existing infra, data pipeline, or model. He stayed through pre-training, post-training (reference-to-video, video extension), and a final stretch leading a small team on real-time long-horizon video generation. > *"By the time I joined, xAI was about to build video models and multimodal models. There were no infra, no data, and no model. Just a few engineers — we built it in three months and released the first model, Grok Imagine 0.9."* ## [04:40] Building Grok Imagine from Zero to One The three-month timeline surprised even Ethan. He attributes it to three factors: talent density (strong engineers who could align on a goal with minimal meetings — typically just one sync a day), xAI's existing data and inference infrastructure, and his own prior experience running the same build at NVIDIA. The bottleneck was iteration speed: how many training runs can you complete per day. With strong infra and abundant compute, bugs surface faster and each failed run costs less, so you burn through the inevitable data and pipeline errors in weeks rather than months. > *"The most important thing is talent. Everyone was very strong and clever, very close to each other toward a common goal. So that speeds up things a lot — you reduce the communication bandwidth among people."* Ethan describes a pattern where small data or pipeline bugs produce outsized quality regressions, and only fast iteration exposes them. A bug invisible at one scale becomes catastrophic at the next. The engineers who find and fix these quickly — not the ones who design the most sophisticated architecture — determine how fast a team ships. ## [11:23] How Image and Video Models Are Trained Video models require synthetic text-video pairs because internet video titles and descriptions almost never describe visual content accurately. The first step is human labeling: at NVIDIA, annotators were instructed to describe every object, character, interaction, and dialogue in a clip as exhaustively as possible. Those labels train an early VLM, which then generates captions at scale. The resulting pipeline — video to VLM to synthetic caption to (video, caption) training pair — is the foundation of both Cosmos and Grok Imagine. Image models must come first: they train faster, require less storage, and the learned representations transfer directly to video. Ethan describes building image models as building the foundation that video sits on top of. The architecture — diffusion transformer operating over VAE latents — is now standard, but the data quality and caption detail remain the primary lever for model quality. > *"Building a video model, you actually need to build an image model first. The data you need is 100% synthetic pairs of language and image, or language to video — because on the internet, videos don't naturally associate with text."* ## [20:09] Video Compression, VAEs, and Real-Time Tradeoffs Raw MP4 compression produces tokens whose latent space is incomprehensible to transformers, so the field moved to learned VAEs that create a smoother, more continuous latent space models can train on. The key design choice is how aggressively to compress the temporal dimension. Temporal compression is efficient — adjacent frames are mostly redundant — but it trades away real-time capability. Wan 2.1 uses 8x8 spatial and 4x temporal compression; generating a single token requires reconstructing four frames, making sub-200ms latency impractical. Ethan frames this as a fundamental tradeoff: high compression rates make training cheap and inference efficient for pre-rendered video, but lock out any use case that needs to respond to live user input. World models require the opposite choice. ## [23:26] Generative UI, Flipbook, and Neural OS Ethan argues that if inference were free, the logical endpoint of video generation is a complete replacement of conventional UI: instead of loading web pages from a server, a model generates them in real time in response to user intent. Flipbook, a demo that went viral, shows this literally — every element of the "browser" is generated by an image model, and clicking a link generates a new page rather than fetching one. The deeper claim is that this is not a novelty but the final form of world models applied to human-computer interaction. A traditional app is a fixed function mapping input to output; a generative UI is a model that can produce any interface the user needs without a developer having to build it first. Ethan calls this a "Neural OS," where the gap between user intent and rendered pixels closes entirely. > *"Imagine the internet doesn't exist and you type in google.com — what should a model show you? The model can imagine something. These web pages completely do not exist, so I can explore anything."* The near-term constraint is inference cost. Current video models cannot generate at interactive frame rates without significant distillation. But Ethan treats this as an engineering problem with a known solution trajectory, not a fundamental barrier. ## [33:26] The Cost of Training Large Video Models Training large video models costs roughly as much as training a medium-scale language model, but the breakdown differs. Compute is comparable, but storage and data movement dominate in ways LLM practitioners do not expect. One billion videos at 5 MB each requires five petabytes of raw storage. The VAE features that must also be stored are roughly the same size again — tens of petabytes total. On AWS S3, five petabytes runs approximately $100K per month before egress. Egress — downloading that data into the training cluster — can exceed storage costs, and each training run pulls the full dataset once. > *"Just storing the videos alone costs a lot. Five petabytes on S3 Standard is $100K per month. And egress — just to download those videos — I believe it's more expensive than storing them, and each training run you probably need to pull them once."* The implication is that video model development is gated on data infrastructure as much as on GPU hours. Teams without efficient data pipelines pay a multiplier on every experiment. ## [38:20] Distillation, GANs, and Fast Video Inference Training-time costs are largely fixed; the inference-time story is more tractable. Step distillation — training a small model to replicate the outputs of a large teacher in far fewer denoising steps — cuts inference cost by 10-25x. Flow-matching models trained to convergence need around 100 steps; production models typically run in 4-8. At the extreme, simple image-to-image tasks can run in a single step. The intuition Ethan offers: the teacher model must learn the full distribution of internet video, which is arbitrarily complex. The distilled student only needs to match the teacher, which is a fixed and much simpler target. Consistency models and LCM-style approaches follow the same logic. In Cosmos, production serving used 4-step and 8-step variants depending on quality requirements. GANs remain relevant as discriminators: a GAN discriminator can enforce photorealism constraints during distillation that pure score-matching loss misses, and Ethan notes that consistency models and GANs are converging on similar practical deployments even if their theoretical motivations differ. ## [42:37] Audio-Video Generation and Grok Imagine 0.9 Grok Imagine 0.9 was the first audio-video joint generation model deployed at scale. The core difficulty is modality alignment: text-video pairs are relatively abundant; text-audio pairs are rare; audio-video pairs aligned at the semantic level are almost nonexistent at scale. Speech tokens are quasi-discrete and can be modeled with language-like approaches, but music is continuous and requires a completely different representation. Training the joint model required building synthetic audio caption pipelines from scratch, with human annotation where VLMs failed — which was often, especially for music. Aligning all three modalities — text, video, and audio — without either degrading video quality or audio realism is what Ethan calls the hardest part of the project. > *"Audio has two components: a discrete component — language — and a continuous component — music. The music is completely different; you cannot model it with discrete tokens. That's the hard part, not to mention we have to align text, video, and audio together."* ## [49:50] What Makes a World Model? Ethan's definition has three components: real-time, interactive, and long-horizon video generation. He treats these as independent requirements, each of which most current models fail. Real-time means generating at display frame rates — 60fps for casual use, 300fps for gaming, 200ms response latency for digital humans. Current video models cannot do this; the VAE's temporal compression alone introduces latency that makes sub-200ms responses nearly impossible without architectural changes. Interactive means the model can accept any input modality the user can provide — keyboard, mouse, voice — and respond coherently. Long-horizon means maintaining consistent physical laws, character identity, and causal logic across minutes, not seconds. > *"World model is real-time, interactive, long-horizon video. Current video models can do none of these three things fully. That's why they're not world models yet."* ## [57:07] Reference Videos, Long Context, and Video Memory The parallel to language model context scaling is direct: video models are in the 2,000-8,000 token era, and will need to scale to million-token-equivalent contexts to generate coherent long videos. Ethan describes the reference-to-video feature he built at xAI (analogous to Cameo) as a mechanism for injecting selected history into the model's context rather than carrying the full video forward. FramePack's heuristic — storing the last second of video at full resolution while compressing earlier frames progressively — points toward the right direction: the model selects relevant context from its history rather than brute-forcing the full sequence. Ethan expects this context management to become part of the model itself rather than remaining a harness-level heuristic, the same way KV cache management is disappearing into model internals. ## [61:27] xAI Culture, Research, and First-Principles Building swyx notes that xAI communicates its research poorly relative to what the work actually demonstrates — the blog post accompanying Grok Imagine describes high-level capabilities without the technical depth Ethan has just spent an hour covering. Ethan is diplomatic but agrees that different labs have different communication styles. The xAI working culture he describes is minimalist: few meetings, no bureaucratic overhead, direct access to leadership judgment on technical decisions, and extreme iteration speed enabled by a strong infra team. The tradeoff is that company priorities shift fast, which is part of what eventually pushed him toward independent research. First-principles thinking — starting from the physics of the problem rather than from what competitors have shipped — runs through the team's approach to both model architecture and product. > *"Everything you just described is state-of-the-art. Like no one else has done it. And then you just put this blog post with the cookies. I'm like, this is not enough."* ## [71:01] AI Safety, Watermarking, and Prompt Rewriting Grok Imagine deployed watermarks in all jurisdictions requiring them and built takedown pipelines integrated with xAI's social platform infrastructure. On watermarking technology, Ethan is skeptical of SynthID's long-term robustness: the technique is documented publicly, and users on Reddit have already reverse-engineered the exact frequency pattern Google applies and can strip it from any generated image. He expects watermark detection to become an arms race. On prompt rewriting: video diffusion models take instructions literally. If a user types "a cat," the model generates a stationary cat on a white background with no motion, because the training data pairs were maximally detailed descriptions of physical scenes. Production systems layer a large language model as a prompt upsampler — converting sparse user instructions into the detailed physical descriptions the video model was trained on. This is one of the reasons Ethan argues language models are increasingly central to video quality. ## [74:26] Video Agents and AI-Assisted Creation Ethan's central claim from the hook: visual intelligence now mostly comes from language. The diffusion model architecture has largely converged; the gains come from larger, smarter LLMs that rewrite prompts, plan video sequences, call editing tools, and stitch clips together. In Cosmos, the prompt rewriter was larger than the video model itself. Video agents extend this: instead of generating a complete video in one shot, an agent plans the production, calls video generation models as tools alongside deterministic editing operations (text overlays, color grading, cuts), and iterates until the output meets a specification. Ethan predicts that by end of 2025, video agent output will reach production-grade quality — presentable video generated without a human editor in the loop. > *"The visual intelligence are actually mostly coming from language. Every time you see improvement on these models, I would say mostly the gain comes from language model, not coming from the video model itself."* ## [88:48] Why Language Models Unlock Better Video LLMs prompt video models better than humans do, because AI models understand AI models' training distributions. A language model knows that a diffusion model needs explicit physical descriptions, not poetic shorthand — and can generate the right prompt format automatically. Beyond prompting, agents can use deterministic video editing tools for precision operations (exact text overlays, frame-accurate cuts) that probabilistic diffusion models handle poorly, keeping the stochastic model focused on generation and delegating precision to tools. Ethan's timeline: video agent output at production quality by end of 2025, with the inflection point visible in work already shipping. ## [92:31] Robotics, Physical AI, and Embodied World Models Ethan's robotics prediction inverts the usual framing: physical AI may be solved not by deploying robots in the real world but by video world models becoming so capable at simulating physical environments that they effectively provide embodied experience. Once a model can control computer interfaces in real time with full causal understanding, extending that to robotic control becomes a matter of adding one more tool. The path from screen-interacting video model to robot controller may be shorter than the path from current robot learning systems to the same capability. ## [93:54] Why Ethan Left xAI Research ambitions and company priorities diverged. xAI's focus shifted in ways that made certain research directions — particularly on the language model side — impractical from inside. Ethan also notes that the insight driving his departure is the same one underlying his "big claim": if language models are now the primary driver of video quality, the most impactful work to do is on language models, not video models. He frames leaving not as dissatisfaction but as following the evidence about where the leverage is. ## [95:32] Self-Managed Context and the Future of LLMs Ethan's active research question: language models that are aware of their own context state and manage it autonomously, rather than relying on harness-level heuristics like automatic compaction at 80% fill. He draws the parallel to video models struggling with long-horizon generation — the same context management problem appears in both modalities. He points to Claude Code's practice of appending the current timestamp to user messages as an early example of making models context-aware, and expects this pattern to be absorbed into model training rather than remaining an external scaffold. > *"The language models are not aware of how long their own context length is. Once they hit like 80% or something, automatic context compaction is getting triggered, and the model is not aware of that when it's working."* ## [99:59] Ethan's Career Path and Closing Thoughts Ethan traces a decade of transitions: ResNet-era image recognition with the original authors at NVIDIA, self-supervised learning at Facebook AI Research, scaling at NVIDIA Cosmos, extreme-scale compute at xAI. He was rejected from every top PhD program despite first-author papers at top conferences, which pushed him into industry. In hindsight he reads his career as consistently following the scaling frontier — from image recognition to SSL to video to LLMs — and argues that within ML, domain switching is far more tractable than practitioners believe. > *"Within ML, it's actually easier to switch than you think. A lot of people have manifested that 'I work on computer vision, I always have to work on computer vision.' But from my experience, the fundamentals transfer."* ## Entities - **Ethan He** (Person): Former xAI researcher who built Grok Imagine from zero; previously led NVIDIA Cosmos world model; now focused on LLM research - **swyx** (Person): Latent Space co-host; conducts technical interviews on AI engineering and research - **Vibhu Viswanathan** (Person): Latent Space co-host; co-interviewer for this episode - **Grok Imagine** (Software): xAI's image and video generation product; first model (0.9) was the first large-scale audio-video joint generation system - **NVIDIA Cosmos** (Software): Open-source video foundation model for robotics simulation; Ethan's project before xAI; released end of 2024 - **xAI** (Organization): Elon Musk's AI lab; known for fast iteration culture and extreme compute resources - **Flipbook** (Software): Viral demo of real-time generative UI; all interface elements generated by image model in real time - **SynthID** (Software): Google's AI watermarking technology; Ethan notes its pattern has been publicly reverse-engineered - **Step distillation** (Concept): Technique to train a model to replicate a teacher's output in far fewer denoising steps; reduces inference cost 10-25x - **VAE** (Concept): Learned video compression creating smooth latent spaces; temporal compression is efficient but creates real-time latency tradeoffs - **World model** (Concept): Ethan's definition — real-time, interactive, long-horizon video generation; distinct from standard video generation - **Video agents** (Concept): Systems where LLMs orchestrate video generation models, editing tools, and deterministic operations to produce production-quality video - **FramePack** (Concept): Progressive temporal compression approach for long-context video generation; stores recent frames at full resolution, compresses older history

Alex Rives — Head of Science at BioHub and the researcher who led ESM-1 through ESM-3 at Meta FAIR — joins Brandon and RJ to explain why he has spent eight years betting that scaling a masked language model on protein sequences would unlock biological structure, function, and design. The episode covers the data shift from UniRef to metagenomics that restored ESMC's scaling law, the sparse-autoencoder feature atlas that mirrors a century of biochemical taxonomy without being taught any of it, and the first reported success at designing therapeutic-grade single-chain antibodies via world-model search. Rives also lays out BioHub's $500 million Virtual Biology Initiative and the principles he believes will produce generalist models of the cell. ## [00:00] ESMC designs antibodies — a preview This opening clip is drawn from later in the interview, where Rives is mid-sentence describing ESMC's approach to programmable biology. He describes searching a protein world-model to satisfy design criteria, and mentions that the team has designed mini-binders and, most notably, single-chain antibody fragments (SCFVs) with therapeutically relevant binding affinities. The clip precedes the formal intro — a signal of what the episode is building toward. ## [00:33] The Bitter Lesson Comes for Proteins Brandon and RJ introduce Alex as possibly "the most bitter-lesson person in protein biology right now." Rives accepts the label. He traces his conviction to 2018, when his team at Meta FAIR trained the first transformer language model on protein sequences using masked-token prediction and watched emergent structural and functional representations appear without any explicit supervision. The key intuition, borrowed from Zellig Harris's 1954 paper on distributional structure, is that the contexts in which an amino acid can appear are determined by the protein's structure, function, and evolutionary role. That statistical pressure, applied across billions of sequences from all of life, should force a model to learn the hidden variables governing protein biology. > *"I believe in scaling laws."* ## [06:00] ESM Lineage: From ESM2 to ESMC Rives walks through four generations of ESM. ESM2 showed scaling gains but hit diminishing returns at 10B parameters — not because the model was saturated, but because the data was. UniRef, the gold-standard protein database, captures cultured organisms and skews heavily toward human-relevant biology. The fix for ESMC was metagenomic data: sequences pulled from hydrothermal vents, polar soils, and sewers, assembled from raw environmental DNA reads with no organismal assignment, partial contigs included. Adding billions of metagenomic sequences to training restored a clean log-linear scaling law, with smaller-scale runs accurately predicting the representational fidelity of the 6B-parameter flagship. > *"There are no longer diminishing returns to scale. ESM2 was data-limited rather than compute-limited."* ESMC is essentially a vanilla transformer with standard masking objectives — no AlphaFold-style MSA, no geometric inductive biases. Brandon and Rives briefly debate whether ESM3's multi-track architecture was a productive detour; Rives says both paradigms have a place, but ESMC's result suggests the priors were not load-bearing at this data scale. ## [18:30] Mechanistic Interpretability and the Protein Feature Atlas Using sparse autoencoders trained across all layers of the ESMC model family (300M, 600M, 6B), the BioHub team extracted the intrinsic feature geometry of the protein representation space. What emerged maps closely to the reductive hierarchy biology developed experimentally over a century — from basic amino-acid chemistry up through structural motifs, domain families, and large functional themes — without any of that taxonomy being fed in during training. > *"The choice of any amino acid is kind of like completely entangled with the choice of all the other amino acids in the sequence. To do this well, the model would start to have these hidden variables that represent the biology."* One concrete finding: the model encodes the nucleophilic elbow — a catalytic motif thought to have evolved independently in several unrelated protein families — as a single feature that activates across all of them. The team also built a structural atlas of 6.8 billion non-redundant proteins with predicted structures for 1.1 billion cluster representatives, and used SAE features to connect evolutionarily distant gene-editing systems. Some proteins pulled into those clusters have no known function; Rives treats them as a discovery queue. The first version of the ESM atlas was already used by an external group to find a new gene-editing system. ## [35:30] Designing Antibodies with ESMC Rives describes protein design as world-model search: invert the generative model to find sequences satisfying target binding criteria. Mini-binders are now routine; nanobodies and SCFVs remain harder for structure-prediction-based methods because antibody evolution maximizes diversity rather than converging on a constrained fold, making MSA-based approaches less useful. ESMC, trained on that diversity at scale, is precisely where the representation should be richest. > *"Antibodies are not going to benefit from evolutionary information probably in the same way that predicting the structural topology of a molecule will."* The team reports SCFV designs reaching therapeutic-grade affinity in a small number of trials, and notes that SCFVs can be reformatted as full IgGs. ESMFold 2 — the structure-prediction head built on ESMC representations — runs in seconds per sequence without MSA, making whole-proteome multimer mapping feasible. Rives says the model is currently state-of-the-art for open-weight multimer prediction. ## [42:00] BioHub's Vision: Toward Programmable Biology Six months into his role at BioHub, Rives articulates the institution's structure: a philanthropy building frontier experimental biology, frontier measurement technology, and frontier AI together under an open-science mandate. He frames the destination as personalized predictive models of physiology — not a pill but a system that can trace molecular events at the protein level up through cellular circuits to disease manifestation in a specific human genome. > *"We're building a scientific institution for this new paradigm."* He maps the levels of biological complexity that must be modeled in sequence: proteins (current generation), the cell (next), tissue and systems, physiology. Getting from proteins to cells requires data that does not yet exist and modeling approaches that probably have not been invented. Current "virtual cell" models generalize poorly — they represent training data well but fail to predict outcomes in novel interventional contexts. > *"They have a very limited ability to predict what will happen when you make a novel intervention in a novel unobserved context."* ## [57:00] The Virtual Biology Initiative and Scaling Cellular Data BioHub recently announced $400M for internal data generation and measurement technology, plus $100M to catalyze external efforts — together the Virtual Biology Initiative. Rives frames this as seed funding: the actual data volume needed is far larger, and the hope is that BioHub's commitment triggers broader scientific community investment. He identifies three data principles: speed (protein data took half a century; the cell cannot wait that long), generalization (the training distribution must span a vast diversity of interventions across cell types and contexts, analogous to metagenomic breadth for proteins), and feedback (active experimental loops guided by model predictions — something like RLVR applied to wet-lab biology). Perturbation sequencing, spatial transcriptomics, and cross-modality single-cell measurement are the scalable technologies ready to run now. On compute: ESMC was trained on roughly one billion sequences. About 100 billion are thought to exist, and the model has not yet fully exploited even the 6.8 billion in the current atlas. A 100x compute increase would help, but only matched with proportional data scale-up. Rives leaves the question of when diminishing returns will appear empirically open — ESM2's curve looked saturated right up until metagenomic data erased it. > *"We need to figure out how to do this in a couple of years. The rate that general AI is developing means biology will be fundamentally limited by experimental science and data."* ## Entities - **Alex Rives** (Person): Head of Science at BioHub; architect of ESM-1, ESM-2, ESM-3, ESMC, and ESMFold 2; formerly Meta FAIR. - **Brandon** (Person): Co-host of Latent Space AI for Science sub-series; affiliated with Atomic AI (RNA therapeutics). - **RJ Honicky** (Person): Co-host; CTO and founder of Miro Omix. - **ESMC** (Software): Fourth-generation protein language model from BioHub/EvoScale; 300M–6B parameters; trained on ~1B sequences including metagenomic data; MIT-licensed open source. - **ESMFold 2** (Software): Structure prediction model built on ESMC representations; MSA-free, seconds-per-sequence inference; state-of-the-art open-weight multimer prediction. - **ESM** (Software): Evolutionary Scale Modeling — the multi-generation protein language model lineage (ESM-1, ESM-2, ESM-3, ESMC) pioneered by Rives's team. - **Sparse Autoencoders / SAEs** (Concept): Mechanistic interpretability tool used to extract the intrinsic feature geometry of ESMC's representation space; reveals biologically interpretable hierarchies without supervision. - **Bitter Lesson** (Concept): Richard Sutton's argument that general methods leveraging compute and data consistently outperform methods encoding domain knowledge; applied here to protein biology scaling. - **Metagenomic Sequencing** (Concept): Environmental DNA sequencing capturing microbial and viral diversity without culturing; the data expansion that restored ESMC's scaling law where UniRef had saturated. - **BioHub** (Organization): Chan Zuckerberg BioHub; a philanthropy building open-science tools at the intersection of experimental biology, measurement technology, and AI. - **Virtual Biology Initiative** (Concept): BioHub's $500M commitment ($400M internal, $100M external) to generate the cellular-scale data needed to train generalist models of the cell. - **AlphaFold** (Software): DeepMind's structure prediction system; uses MSAs and geometric inductive biases; contrasted with ESMC's MSA-free approach. - **UniRef** (Software/Database): Gold-standard curated protein sequence database; the training data for ESM2, later found to be the bottleneck causing ESM2's scaling plateau. - **Nucleophilic Elbow** (Concept): A catalytic structural motif appearing in multiple evolutionarily unrelated protein families; encoded as a single ESMC feature activating across all of them. - **Zellig Harris** (Person): Linguist; 1954 paper "Distributional Structure" articulated that word contexts encode meaning — a theoretical precursor Rives cites for why amino-acid context statistics should encode biological function.

In this lightning episode, swyx sits down with Sunil Pai — Cloudflare developer platform lead and, according to swyx, creator of Code Mode — to cover three distinct threads: Cloudflare's infrastructure bet on Durable Objects and Dynamic Workers as the substrate for AI agents, the Twitter misunderstanding with Vercel that briefly convinced Sunil his career was over, and why forking code is an act of respect rather than aggression. Sunil closes with a direct challenge: stop building incremental agent frameworks and build science fiction instead. ## [00:00] Who invented Code Mode? The video opens on a three-second slate. What follows immediately — swyx introducing Sunil as "creator of Code Mode," Sunil accepting the credit with mock grandeur, claiming he has been thinking about it since childhood — is the opening exchange that this placeholder covers contextually. It is pure banter between two old friends, not a teaser pulled from later. ## [00:03] Introduction and Sunil Pai's background swyx reintroduces Sunil as an old friend and keynote speaker at AIE Europe. The brief catch-up frames what follows: Sunil's current focus is Cloudflare's platform for AI agents, and the recent Anthropic Cloud Managed Agents launch gives him a concrete foil to argue against. > *"I wanted to just catch up on everything going on in Cloudflare lands."* ## [00:30] Discussing the new cloud-managed agents Anthropic's newly launched Cloud Managed Agents product — a platform for building and deploying long-running agents — is Sunil's jumping-off point. He says he likes the Anthropic team and finds the product interesting, but his reaction on reading the spec was competitive: Cloudflare can do this better. swyx asks what Cloudflare actually has that makes that claim credible. > *"I looked at the product and I was like I think I want to compete. I think we can do something better with Workers and Durable Objects."* ## [01:10] Cloudflare's core infrastructure: Durable Objects and Dynamic Workers Sunil names two primitives he believes every agent platform will eventually need. Durable Objects are stateful serverless units — his claim is that they are the world's first infrastructure-layer implementation of the actor model rather than a user-land library. Dynamic Workers are Cloudflare's answer to running LLM-generated code safely: eval re-imagined with zero startup time, configurable API surface, and outgoing traffic locked down by default. Together they let Cloudflare run agent steps in sandboxed compute without spinning up full VMs. > *"It's the world's first implementation of the actor model in an infrastructure layer, not in user land."* ## [02:34] How Cloudflare approaches AI agent architecture The Cloudflare MCP server, built by colleague Matt Carey, shows Dynamic Workers in practice. The Cloudflare API has 2,600 endpoints — exposing one tool per endpoint would destroy any LLM context window. Instead, the server collapses everything into two tool calls: `search` and `execute`, both backed by JavaScript code running in an isolate. The agent submits code, the isolate runs it, the result comes back — no back-and-forth, type-checked. > *"In one tool call, no back and forth with the LLM, and it's type checked, and well, turns out LLMs are great at running code."* ## [03:40] The future of agentic software and standardizing the "harness" swyx asks whether the harness concept from Anthropic's spec could become a cross-platform standard. Sunil's answer: nobody has built the React of AI agents yet. He draws the 2013 React analogy deliberately — people walked out of the JSConf talk, accused Facebook of hating JavaScript, and yet React defined every UI framework that followed. Right now everyone is building their own harness in their own shape, and nothing is reproducible across languages, companies, and infrastructure. swyx floats the idea that skills — plain markdown — might already be that unifying layer; Sunil finds the idea genuinely appealing but worries about the specificity ceiling. > *"It's so hard, but the way I'm framing it in my head is no one has built the React yet."* ## [06:11] The "slop forks" phenomenon and open-source culture swyx raises "slop forks" — AI-generated forks of popular projects — and Sunil lights up. In his framing, forking is a gesture of prestige and respect, not theft. The React ecosystem grew through forks. He tells anyone interested in building something competitive with the Cloudflare Agents SDK to go for it: everyone wins if they do. > *"Forking is a great sign of prestige respect in my culture."* ## [06:36] The Vercel / Cloudflare social media misunderstanding At JSConf España, Sunil met Harvey from Vercel and loved spending time with him. He found Vercel Labs' Just Bash — a pure JavaScript implementation of Bash — and wanted to port it to Cloudflare. He pointed Opus at the codebase over lunch, got 5,000 lines of code back, and planned to clean it up before sending a proper PR on Monday. He crashed, woke up to DMs from Cloudflare management asking if he had seen Twitter: the Vercel CTO had publicly criticised the work, framing it as a corporate move rather than a personal side project. Sunil responded plainly, explained the context, and then watched half the internet rush to defend him. > *"I go on Twitter and the Vercel CTO is trashing my work saying… 'It's Cloudflare did this.'"* ## [09:45] The importance of forking in software development swyx connects the Vercel incident to a broader pattern: a leaked codebase someone rewrote in Python to escape the license (lawyers ruled it a derivative work anyway). The real argument swyx makes is that slop forks are worth encouraging — fork a dependency, vendor it, own it — so you avoid the sudden upstream breakage of the LiteLLM or Axios problem. Sunil agrees: before NPM, software spread on Usenet through exactly this pattern, and shortening the fork cycle is just that tradition continuing. > *"Forking is so fundamental to how we build software."* ## [12:04] The adversarial nature of modern open-source repositories The Cloudflare Agents SDK has had to shut down pull-request contributions entirely; only issues are allowed now. Sunil talks to open-source maintainers at the conference who describe the same thing: repos have become adversarial territory, and the worst attack vector is fake security reports that look entirely legitimate until you read them carefully. swyx ties this to a morning talk by Peter from Claude Code — the number one current attack surface is a compromised dependency getting into Claude Code, which would give access to every developer using it. > *"Open source repos have become adversarial to the point that people are almost afraid of gaining popularity in that space."* ## [13:04] Closing thoughts and encouragement to be original Sunil's closing ask is direct: stop building the tenth agent framework. Build science fiction. Build something for your family. Use the Agent SDK, but use it for something where the infrastructure and the LLMs almost fail you — because that's where the next step change lives. swyx closes with a callback to Sunil's 2018 React Rally coinage of "alpha thought leading." > *"Build sci-fi stuff. Build stuff like for your family. You own so much agency in changing the world and I want people to just be original."* ## Entities - **swyx** (Person): Host of Latent Space; long-time friend of Sunil; coined "alpha thought leading" after a Sunil quip at React Rally 2018. - **Sunil Pai** (Person): Developer platform lead at Cloudflare; credited by swyx as creator of Code Mode; keynote speaker at AIE Europe. - **Cloudflare** (Organization): Cloud platform company; building agent infrastructure on Durable Objects and Dynamic Workers. - **Anthropic** (Organization): AI company; launched Cloud Managed Agents, the product Sunil positions Cloudflare to compete with. - **Vercel** (Organization): Frontend cloud company; Sunil uses their AI SDK; subject of the Twitter misunderstanding. - **Durable Objects** (Software): Cloudflare's stateful serverless primitive; Sunil's claim is it is the world's first infrastructure-layer actor-model implementation. - **Dynamic Workers** (Software): Cloudflare feature for running LLM- or user-generated JavaScript in a safe, zero-cold-start isolate. - **Just Bash** (Software): Vercel Labs project — a pure JavaScript implementation of Bash — that Sunil was porting to Cloudflare when the Twitter incident occurred. - **MCP** (Concept): Model Context Protocol; Cloudflare's MCP server collapses 2,600 API endpoints into two tool calls using Dynamic Workers. - **Slop forks** (Concept): AI-generated forks of existing projects; Sunil frames them as continuation of open-source forking culture — a sign of respect, not plagiarism.

Recorded live at AI Engineer London, swyx sits down with Omar Sanseviero — Google DeepMind's Head of Developer Experience — for a tight 30-minute sprint through Gemma 4's architectural novelties, Google's open-model strategy, and where the DevEx team is growing next. Omar pulls back the curtain on per-layer embeddings, why fine-tuning fever has cooled, what Kaggle joining DeepMind actually means for benchmarks, and whether "auto-research" is real or still hype. ## [00:00] Introduction to Gemma 4 and team scope Omar's one-sentence pitch: Gemma 4 packs "the most capable open model we've released so far," with a hard constraint on squeezing maximum intelligence per parameter and full multimodal support — all while keeping the weight footprint tractable for local inference. > *"We really tried to compact as much intelligence per parameter as we could."* ## [00:23] Explanation of effective vs. active parameters The key architectural move in Gemma 4's small models is a per-layer embedding table inserted into each transformer block. Because it's a lookup rather than a matrix multiply, the 3B embedding parameters never need to be resident in GPU memory — they sit on CPU or disk while only the 2B active parameters do live compute. Omar is candid that this trick is purpose-built for on-device: at larger scales you'd rather use dense or MoE layouts. > *"The Gemma 4 model is E2B. That means it effectively has 2 billion parameters loaded into the GPU. It actually has almost 5 billion parameters, but those 3 billion parameters can be in the CPU, they can be in the disk."* ## [01:43] On-device use cases and Gemini Nano integration Pixel phones and high-end Samsung devices ship Gemini Nano out of the box — and Gemini Nano is trained on top of Gemma 3N, the architecture Google designed specifically for phone constraints. The same parameter-offloading idea from Gemma 4 applies to those smaller variants. When swyx asks whether it scales to the 29B–31B tier, Omar says only "we are doing lots of experiments — stay tuned." > *"When you buy like these high-end phones, you can already use a Gemini out of the box."* ## [03:14] Behind the scenes of a model launch and developer ecosystem The Gemma team is smaller than most people expect — two or three PMs, one marketer, and the core engineers and researchers. What makes a launch complex is the external graph: 50 partners (llama.cpp, Ollama, MLX, Hugging Face, vLLM, Nvidia, AMD, and more) coordinated in parallel, plus internal collaboration with Google Cloud, Vertex, ADK, and Android. The Gemma 4 launch also shipped a native integration with Android Studio's agent mode, letting developers run offline Gemma 4 inference for code assistance. > *"We have almost 50 external partners for the Gemma 4 launch, which has been the most complex launch."* ## [04:29] Offline vs. API usage and future model growth The offline/privacy split is real but not the whole story. Omar draws a cleaner line: local models today are excellent at capabilities (function calling, instruction following, agentic tasks) but still lose on knowledge density — you need a large model to reliably recall niche facts. His 1–2 year bet: a Gemini Pro-class model running entirely on-device, enabling experiences currently gated behind an API connection. > *"I do think we are heading towards a future in 1 to 2 years where you can run a Gemini Pro powerful model directly in your phone."* ## [06:26] Gemma 4 multimodal capabilities and limitations Gemma 4 inherits Gemini 3's research stack, which gives even the 2B model audio understanding (speech recognition, speech-to-translated text, question-answering over audio clips) and vision (object detection, pointing, captioning). Two gaps Omar names explicitly: image segmentation is missing, and simultaneous video + audio in a single prompt isn't supported — they need to enter as separate streams. Native speech output is being explored but nothing announced. > *"We can understand video input or audio input separately, but if you want to pass in the same prompt both a visual part and the audio part, we still need to do some improvements around that."* ## [08:08] Multilingual tokenizer insights Gemma's tokenizer is the same one powering Gemini — a design choice that gives it unusually strong multilingual footing across 140 languages. Omar's concrete finding: take Gemma 3 as a base, fine-tune it for a Southeast Asian language like Vietnamese, and it outperforms base models that score higher on English benchmarks. The tokenizer captures language-appropriate tokens rather than forcing non-Latin scripts through subword fragments optimized for English. > *"If you fine-tune all of these models for a specific Southeast Asian language — Vietnamese, let's say — Gemma would yield better results even if the other base models were potentially better."* ## [09:30] Google's Developer Experience team at AI Engineer London is DeepMind's home, so showing up with a full team for AI Engineer Europe was a deliberate statement. Omar brought researchers across Gemma 4 development, diffusion text generation, robotics, on-device ML, and Android — not just a DevEx roadshow. swyx names the scope plainly: "It is the lab with the biggest scope. Like you do everything including dolphins." > *"We brought people from robotics to research to Android. It's quite exciting to really show all of the things the company's building."* ## [10:42] Introduction to research areas: diffusion models for text Google announced Gemini Diffusion at I/O — a diffusion transformer that generates text (not images) at substantially higher speed than autoregressive decoding. Omar's honest take: quality still lags autoregressive baselines, and fine-tuning diffusion transformers is harder because distribution shifts affect routing differently. swyx sketches a plausible architecture where diffusion models act as fast system-one executors while autoregressive models handle complex planning — Omar thinks it's plausible but premature. > *"At the moment it's still very experimental. The model quality is still a bit worse from what you would get from a normal auto-regressive model."* ## [13:37] Current state of fine-tuning and community trends Fine-tuning communities peaked around 2023; Omar is now watching the tide go out. Several Gemma 4 launch partners planned fine-tunes of the 27B vision model and canceled mid-process because the base model already did the job. General-purpose behavior changes that once required fine-tuning are now handled by prompting. What's left: domain-specific fine-tuning for healthcare, finance, and niche data — plus the organizational challenge of managing LoRA compatibility when the base model updates. > *"We saw lots of those things — so I'm seeing less excitement around fine-tuning nowadays as general conversational models."* ## [16:29] Trade-offs between dense and sparse architectures Gemma 4 ships two large models at similar weight counts: a 31B dense (highest raw intelligence, fits a consumer GPU when quantized) and a 27B MoE with 4B active parameters (fastest inference within the same hardware envelope). The size choices were deliberate developer-friendliness decisions. Omar's warning for fine-tuners: MoE training recipes and hyperparameters don't transfer cleanly from dense models — the distribution shift hits routing in ways that aren't fully understood, possibly because input distribution changes alter which experts fire. > *"MOEs are challenging to fine-tune. They work great for inference, but when people fine-tune them, they struggle a bit."* ## [18:29] Intelligence per parameter and future research Across Gemma 2, 3, and 4, Google has held the top parameter count roughly constant at ~30B while the capability ceiling has risen significantly — a direct demonstration of improving intelligence per parameter. The harder comparison problem: once you introduce MoE sparsity and parameter offloading, parameter counts stop being a common currency. Omar's honest horizon: knowledge limitations are probably structural — a 30B model in 3 years will still miss very niche factual recall because information theory limits how much you can compress into fixed weights. > *"What's the intelligence per parameter? How do we maximize this intelligence per parameter?"* ## [20:09] Gemma Scope and mechanistic interpretability Google released Gemma Scope in December — a toolkit for analyzing per-layer activations across Gemma 3 models, backed by a multi-terabyte (possibly petabyte-scale) activation dataset covering every layer. Omar pitches mechanistic interpretability as a low-compute entry ramp into ML research: you don't need a training cluster to run activation analysis, and the experiments give you tangible intuition about how transformer internals work. > *"It's an area where you don't need lots of compute to get started. That allows you to understand how a model works."* ## [21:12] The intersection of research and engineering The catalyst for bringing researchers to an engineering conference: engineers trust models more when they understand how they were built, even if they'll never train one themselves. Omar and swyx both note the boundary between research and engineering has blurred — most researcher work is empirical ablations closer to engineering than theory, and coding agents give engineers direct access to experimentation that previously required a research background. Omar cites the franken-merge and Axolotl community as an example of Reddit and Discord independently rediscovering techniques that research labs later published as papers. > *"There are lots of empirical experimentation and seeing what works, what doesn't work, moving things around — which for me is much more engineering rather than research."* ## [23:59] Perspectives on "Auto-research" and agentic automation swyx frames the real question: is auto-research just "agentic parameter sweeps" or can it produce Move 37-style discoveries nobody would have searched for? Omar is cautiously skeptical — AutoML's track record was mostly grid search in disguise, and deep architecture work is probably not automatable in the next 1–2 years. But he does think fine-tuning itself will soon be entirely agent-driven: users will prompt an agent to kick off experiments rather than write training code, using tools like Hugging Face's AutoTrain or Axolotl's CLI. > *"The next generation of fine-tuners will be people that are not coding at all. Most people will be fine-tuning with a couple skills."* ## [26:06] Team expansion, global hubs, and Kaggle integration The DevEx team is now hiring in Singapore and India — co-located with DeepMind research offices so DevRel staff can walk down the hall to researchers rather than sitting in isolated sales satellite offices. The bigger org news: Kaggle joined DeepMind, and its competition and benchmark infrastructure connects directly to Gemma/Gemini capability gaps — community-created benchmarks can flow back as training signal. Omar describes the model as feedback-loop driven: the team engages on social and at events to understand what developers are building, then brings that signal to the modeling side. > *"The way we are doing Gemma, Gemini, and all of our tools is really based on the feedback from the startups, the community, the developers."* ## Entities - **Omar Sanseviero** (Person): Head of Developer Experience at Google DeepMind; formerly grew DevRel at Hugging Face; leads Gemma developer ecosystem. - **swyx** (Person): Host of Latent Space podcast; interviewer at AI Engineer London 2026. - **Gemma 4** (Software): Google's open model family featuring per-layer embedding architecture (E2B effective parameter offloading), 2B/4B/27B MoE/31B dense variants, 140-language support, multimodal input. - **Gemini Nano** (Software): On-device model built on Gemma architecture, shipped with Pixel and high-end Samsung phones via the OS. - **Gemma Scope** (Software): Google's toolkit for mechanistic interpretability — analyzes per-layer activations across Gemma 3 models; released December 2025 with petabyte-scale activation data. - **Gemini Diffusion** (Software): Google's experimental diffusion transformer for text generation (not images), announced at Google I/O; primary benefit is inference speed. - **Kaggle** (Organization): Competition/benchmark platform that joined Google DeepMind; integrates community-created evals with Gemini capability feedback loops. - **Google DeepMind** (Organization): Google's consolidated AI research lab; scope spans Gemma, Gemini, robotics, on-device ML, and mechanistic interpretability. - **AI Engineer London** (Organization): Applied AI engineering conference (2026 edition); location for this interview, DeepMind's home city. - **MoE (Mixture of Experts)** (Concept): Sparse architecture where only a subset of parameters activates per token; faster inference than dense at equivalent parameter count, but harder to fine-tune due to distribution-sensitive routing. - **Per-layer embedding** (Concept): Gemma 4's architectural change — a lookup-table embedding inserted at each transformer layer, enabling 3B parameters to live off-GPU without matrix multiply cost. - **Intelligence per parameter** (Concept): The capability-to-weight ratio that Gemma 2→3→4 has improved while holding total parameter count ~constant at 30B.

Ivan Burazin, CEO of Daytona, discusses the massive shift from building developer environments for humans to providing composable computers for AI agents. With 74% month-over-month growth and 850,000 daily runs, Daytona provides the bare-metal infrastructure required for stateful, high-performance agentic workflows. This conversation explores the technical challenges of spiky compute, the $10 trillion computer-use market, and why the future AI cloud will look more like Stripe than AWS. ## [00:00] Hook Ivan Burazin describes the intense, direct demand for Daytona's infrastructure, with potential users calling him personally to request access. This level of interest signaled a massive, untapped market for providing execution environments to every future AI agent. The team realized they had identified a critical missing piece in the AI development stack. > *I've never experienced this that people literally call you if you do not give them access. Like they want access right now.* > *[0, 0]* > * ] }, { * > *title": "Introduction* > *{'start': 72.0, 'summary': "Host swyx introduces Ivan Burazin, noting their shared history in the developer experience and 'end of localhost' movements. Ivan recalls reaching out to swyx years ago for advice on developer experience while working at a previous role. They reflect on how their early interactions and mutual interests in cloud-based development tools eventually led to their current collaboration.", 'quotes': ['I was one of the co-founders of code anywhere... we were thinking a long time of like local host should die.', [1, 36], '\n ]\n },\n {\n ', 'title": "CodeAnywhere', 'Shift', 'and the end of localhost', {'start': 195.0, 'summary': 'Ivan discusses his long history with his co-founder, dating back to early 2000s virtualization and the creation of CodeAnywhere. As the first browser-based IDE, CodeAnywhere predated modern infrastructure like Docker and Kubernetes, which provided the team with deep foundational knowledge. After a successful run with the Shift developer conference, they returned to their infrastructure roots to launch Daytona.', 'quotes': ['We originally started stacking stacking servers doing like virtualization in the early 2000s... and that was a services company which we sold.', [3, 38], '\n ]\n },\n {\n "title": "What Daytona is: composable computers for AI agents",\n "start": 358.0,\n "summary": ', "Ivan defines Daytona as a provider of 'composable computers' for AI agents", "moving beyond the limited industry term 'sandboxes.' He explains that agents require diverse computing environments tailored to specific tasks", 'much like different hardware setups for human professionals. This API-driven infrastructure allows agents to execute code in production-grade environments rather than just temporary test boxes.', {'quotes': ['What Daytona is today is essentially composable computers for AI agents... the market calls them sandboxes which [is] misleading.', [6, 41], '\n ]\n },\n {\n ', 'title": "The pivot from dev environments to AI sandboxes', {'start': 487.0, 'summary': "Ivan explains how observing early agents like Devon and OpenHands led to a realization that AI agents require a dedicated compute runtime. While their initial SaaS offering for human automation saw low traction, it attracted developers who specifically needed sandboxes for their agents. This feedback loop revealed a massive, underserved market for agent-specific infrastructure that standard cloud providers weren't addressing.", 'quotes': ['a lot of people reached out that were building agents and they were like hey my agent needs a compute sandbox runtime', [8, 50], '\n ]\n },\n {\n ', 'title": "The New Year’s Eve MVP and customers begging for API keys', {'start': 617.0, 'summary': "On New Year's Eve, Ivan 'vibe-coded' the first MVP of what would become the new Daytona. Although the CTO initially dismissed the code as 'garbage,' the core idea was strong enough to warrant a two-week professional rebuild. When they demoed this version to previous skeptics, the response was immediate and overwhelming, with users demanding API access before the calls even ended.", 'quotes': ["I've never experienced this that people literally call you if you do not give them access.", [12, 18], '\n ]\n },\n {\n ', 'title": "Bare metal', 'stateful sandboxes', 'and Daytona’s scheduler', {'start': 776.0, 'summary': "The team approached the technical architecture from first principles, deciding to run on bare metal rather than traditional VMs. They aimed to combine the speed of AWS Lambda with the stateful, long-running nature of an EC2 instance. This allows agents to 'pause and come back' to their work, much like a human closing a laptop lid, without losing state or performance.", 'quotes': ["agents will be like humans in the sense of you don't want your laptop to be shut down until you're done with work", [13, 57], '\n ]\n },\n {\n ', 'title": "60ms startup', 50, 0, 'sandboxes', 'and 850K daily runs', {'start': 1048.0, 'summary': "Daytona's infrastructure is optimized for both individual speed and massive concurrency, with a single instance spinning up in just 60 milliseconds. This scale supports high-volume customers who perform nearly 850,000 runs daily, with some requesting capacity for half a million concurrent CPUs. The system utilizes a custom scheduler and local NVMe drives to eliminate network latency and maximize IOPS.", 'quotes': ['Our time to spin up one is 60 milliseconds with network latency... if you want to spin up 50,000 at once, we are now at about 75 seconds.', [17, 40], ',\n ', 'The biggest customer of ours does like about 850', 0, "every single day is sort of where they're where they're just shy of a million.", [18, 17], '\n ]\n },\n {\n ', 'title": "Spiky RL/eval workloads and the new agent infra problem', {'start': 1313.0, 'summary': "The 'spiky' nature of AI workloads presents a major challenge for compute providers, leading to a mean utilization rate of only 15% despite peaks hitting 90%. Workloads are categorized into 'background agents' that follow human cycles and 'evaluations/RL' which fire off massive bursts of activity at unpredictable hours. To manage this, Daytona must use capacity commits to handle sudden bursts of 100,000 or more CPUs.", 'quotes': ["Daytona's mean utilization is 15%... because it's very spiky. But it's very spiky but we get up to 90%.", [23, 1], '\n ]\n },\n {\n ', 'title": "RL workloads', 'Kubernetes pain', 'and dynamic resizing', {'start': 1692.0, 'summary': "Daytona competes primarily against managed Kubernetes services like EKS and GKS, positioning itself as a more ergonomic 'Twilio or Stripe' for compute. Unlike Kubernetes, Daytona offers a seamless API for spinning up sandboxes with significantly faster startup times. A key advantage is the ability to dynamically resize sandboxes on the fly to prevent out-of-memory (OOM) errors, a feature difficult to implement on other platforms.", 'quotes': ["Daytona although it's a compute provider it's more akin to a Twilio and Stripe from a consumption perspective than it is an AWS", [29, 46], '\n ]\n },\n {\n ', 'title": "Why every AI agent needs a computer', {'start': 2011.0, 'summary': "Ivan outlines the massive scale of knowledge work, estimating a $50 trillion global salary pool, much of which is locked in legacy Windows applications. He argues that true automation requires 'human emulators' that can interact with these legacy systems via GUIs when APIs are incomplete. By automating 40% of this work, the market opportunity for agentic computer use reaches approximately $10 trillion annually.", 'quotes': ['If you take 40% of that, you get to essentially like 10 trillion dollars a year.', [35, 20], '\n ]\n },\n {\n ', 'title": "macOS sandboxes and Apple’s licensing problem', {'start': 2328.0, 'summary': "The discussion shifts to the difficulties of hosting Mac OS sandboxes compared to Windows and Linux. Apple's restrictive licensing only allows two parallel VMs per machine and requires a 24-hour lock-in for users, making per-second billing economically unfeasible. Furthermore, security restrictions prevent moving memory snapshots between physical machines, severely limiting the scalability of agentic workloads on Mac hardware.", 'quotes': ['Apple is shooting itself in the foot... if it would just enable a concurrency model similar to what you can get on a Windows.', [40, 52], '\n ]\n },\n {\n ', 'title": "Why CLI may matter more than MCP', {'start': 2668.0, 'summary': "The discussion compares the Model Context Protocol (MCP) to the Command Line Interface (CLI) for agentic action. While MCP acts as an interface for APIs, the CLI allows agents to execute scripts and perform deep data analysis within a sandbox. This layer of indirection enables more complex agentic workflows beyond simple data retrieval, allowing agents to actually 'do things' rather than just integrate.", 'quotes': ['the MCP is an interface against an API whereas the CLI is like you can actually go do things... the difference between integrations and actually running scripts.', [45, 34], '\n ]\n },\n {\n ', 'title": "Open source', 'GitHub stars', 'and agent integration', {'start': 2891.0, 'summary': "Ivan details Daytona's transition to an AGPLv3 license for its sandbox product to balance openness with commercial protection. This 'copyleft' approach allows enterprise use but prevents competitors from building proprietary forks without contributing back. Keeping the core engine transparent builds trust with users and allows large enterprises to bypass lengthy security audits by providing agents with full context.", 'quotes': ["in the new sandbox product we did add a AGPL3... you essentially can't make a competitor without open sourcing your stuff.", [49, 49], '\n ]\n },\n {\n ', 'title": "Git', 'CI/CD', 'and agent collaboration bottlenecks', {'start': 3191.0, 'summary': 'Current versioning systems like GitHub are often too slow for the high-velocity output of AI agents, leading to bottlenecks in CI/CD pipelines. Some developers are creating makeshift solutions like dumping codebases into JSON files on S3 to bypass Git overhead. There is a growing need for an agent collaboration layer that precedes the traditional Git-based pipeline to handle companies generating over 1,000 PRs per day.', 'quotes': ["GitHub as-is was an overhead... it wasn't fast enough what they needed.", [54, 3], '\n ]\n },\n {\n ', 'title": "Founder life and building a 25-person infra company', {'start': 3495.0, 'summary': "Daytona's success stems from a core team of 13 people who have worked together for over seven years, fostering a high-trust culture. Ivan acknowledges the difficulty of the founder journey, including being away from family, but posits that growth requires 'pain.' He views his work as building the spiritual successor to serverless and Kubernetes for the agent era, requiring radical responsiveness as a differentiator.", 'quotes': ['Of the 25 people in Daytona, I think about 13 of them we have worked with seven years plus.', [58, 57], '\n ]\n },\n {\n ', 'title": "AI SaaS', 'token resale', 'and API-first business models', {'start': 3764.0, 'summary': 'Ivan presents a critical take on the SaaS ecosystem, arguing that the market is incorrectly applying a premium to vendors who simply resell AI tokens. He points out that these models have significantly worse margins than traditional SaaS. Instead, he advocates for companies to expose their data via APIs and charge for consumption, allowing for actual revenue acceleration through increased agentic usage.', 'quotes': ["The market is adding premium to SAS vendors that are reselling tokens. And I think that's incorrect.", [62, 54], '\n ]\n },\n {\n "title": ', 'GPU sandboxes', 'data centers', 'and compute growth', {'start': 3970.0, 'summary': 'Daytona plans to introduce GPU sandboxes to support workloads like 3D rendering and reinforcement learning on CAD, rather than focusing on inference. While the company currently runs on bare metal via colocation providers, Ivan notes they are architected to potentially own data centers in the future. He currently avoids the high capital risk of building data centers for single-digit margin gains.', 'quotes': ['We will [offer GPUs], but not for inference. Like essentially what we think about is like the GPU sandbox.', [66, 21], '\n ]\n },\n {\n ', 'title": "Why the AI cloud may look more like Stripe than AWS', {'start': 4188.0, 'summary': "The conversation concludes by imagining the 'AWS for AI Agents,' which Ivan suggests might look more like Stripe than a traditional cloud provider. This future 'AI Cloud' will integrate sandboxes, web search, and databases as fundamental primitives. While companies like Cloudflare and OpenAI are competing for this space, Ivan hints that many more infrastructure primitives for agents are yet to be developed.", 'quotes': ["There will be a cloud built out specifically for agents and so that cloud will have sandboxes and it will have web search and it'll have databases.", [70, 47], '\n ]\n },\n {\n ', 'title": "Closing thoughts', {'start': 4286.0, 'summary': 'The discussion ends with the observation that the AI infrastructure market is growing at an unprecedented baseline of 40-75% month-over-month. Ivan and swyx reflect on the race to secure hardware and the shift toward specialized agent clouds that will define the next decade of computing.', 'quotes': ["The entire infrastructure market is growing 40% plus or minus month over month... if you're not growing 40%ish... you don't have to come to work.", [68, 23], '\n ]\n }\n ],\n ', 'entities": [\n {\n "name": "Ivan Burazin', {'type': 'person', 'description': 'CEO of Daytona and co-founder of CodeAnywhere.'}, {'name': 'swyx', 'type': 'person', 'description': 'Host of Latent Space and early investor in Daytona.'}, {'name': 'Daytona', 'type': 'organization', 'description': 'A company providing composable computers and sandboxes for AI agents.'}, {'name': 'CodeAnywhere', 'type': 'organization', 'description': 'The first browser-based IDE, co-founded by Ivan Burazin.'}, {'name': 'Devon', 'type': 'product', 'description': 'An early AI software engineer agent.'}, {'name': 'OpenHands', 'type': 'product', 'description': 'An open-source AI agent project formerly known as OpenDevin.'}, {'name': 'Kubernetes', 'type': 'technology', 'description': "Orchestration technology mentioned as a competitor to Daytona's ergonomic API."}, {'name': 'Apple', 'type': 'organization', 'description': 'Mentioned regarding restrictive Mac OS virtualization licensing.'}, {'name': 'Salesforce', 'type': 'organization', 'description': 'Cloud-based software company mentioned for its API-first strategy.'}, {'name': 'GitHub', 'type': 'organization', 'description': 'Developer platform noted for being a bottleneck in agentic CI/CD workflows.'}, {'name': 'Nvidia', 'type': 'organization', 'description': 'The primary provider of GPUs whose supply constraints dictate market growth.'}, {'name': 'Stripe', 'type': 'organization', 'description': 'Used as a comparison for the consumption-based model of the future AI cloud.'}], 'tags': ['ai-agents', 'infrastructure', 'sandboxing', 'bare-metal', 'cloud-computing', 'developer-tools', 'computer-use', 'saas-growth'], 'seo_title': "AI Agents Need Computers: Ivan Burazin on Daytona's Pivot", 'seo_description': 'Ivan Burazin explains why AI agents need composable computers and how Daytona pivoted from dev environments to 850K daily agent runs.', 'confidence': {'score': 0.98, 'rationale': 'The summary synthesizes multiple detailed chunks covering technical metrics, business strategy, and market philosophy with high fidelity to the source.'}}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}* ## [01:12] Introduction ## [03:15] CodeAnywhere, Shift, and the end of localhost ## [05:58] What Daytona is: composable computers for AI agents ## [08:07] The pivot from dev environments to AI sandboxes ## [10:17] The New Year’s Eve MVP and customers begging for API keys ## [12:56] Bare metal, stateful sandboxes, and Daytona’s scheduler ## [17:28] 60ms startup, 50,000 sandboxes, and 850K daily runs ## [21:53] Spiky RL/eval workloads and the new agent infra problem ## [28:12] RL workloads, Kubernetes pain, and dynamic resizing ## [33:31] Why every AI agent needs a computer ## [38:48] macOS sandboxes and Apple’s licensing problem ## [44:28] Why CLI may matter more than MCP ## [48:11] Open source, GitHub stars, and agent integration ## [53:11] Git, CI/CD, and agent collaboration bottlenecks ## [58:15] Founder life and building a 25-person infra company ## [1:02:44] AI SaaS, token resale, and API-first business models ## [1:06:10] GPU sandboxes, data centers, and compute growth ## [1:09:48] Why the AI cloud may look more like Stripe than AWS ## [1:11:26] Closing thoughts

Jake Cooper, CEO of Railway, details the platform's evolution from a high-burn startup to a sustainable, bare-metal cloud infrastructure powering 3 million users. He argues that the rise of AI agents necessitates a fundamental rebuild of the cloud, moving away from human-centric tools like Kubernetes and pull requests toward high-density CLI handles and production forking. This conversation provides a roadmap for building modular, high-scale systems capable of supporting the next generation of automated software development. ## [00:00] Intro Jake Cooper argues that developers should stop writing code by hand and instead focus on reviewing agent-generated code to maintain architectural integrity. He emphasizes that while AI tools have improved significantly, underlying architectural patterns matter more than ever in an automated workflow. The hosts introduce Jake as the 'Conductor' of Railway, setting the stage for a discussion on the future of cloud platforms and developer experience. > *you should be reviewing the code that you are writing instead of trying to go and write it by hand.* > *[0, 10]* ## [01:19] What Is Railway? Railway is described as a platform that allows users to deploy applications and databases instantly via a canvas or AI prompts like Claude. Jake explains that the goal is to manage software versioning and environment cloning to reduce the complexity of traditional tools like Docker and Kubernetes. By tracking all changes, Railway enables developers to fork production environments into parallel universes for safe validation without reproducing staging environments manually. > *railway is the easiest way to ship anything.* > *[2, 29]* > *we want to make it really easy for not just to like deploy things, but for you to almost like evolve applications over time.* > *[2, 49]* ## [03:26] Jake’s Path to Railway Jake details his professional journey from front-end work at Wolfram to building distributed systems for Jump bikes at Uber using Cadence. He describes his engineering philosophy as a willingness to 'swim to the bottom of the pool,' which includes writing kernel patches to ensure the best possible user experience. Additionally, he critiques GitHub's architecture, specifically the 'broken pointers' created by cloning, which complicates upstream contributions. > *we will swim to the bottom of the swimming pool to go and get the experience* > *[4, 35]* > *GitHub's original sin is that it's like almost a series of broken pointers.* > *[6, 2]* ## [07:32] Railway’s Six-Year Growth Story Jake presents a growth chart illustrating the rapid increase in daily signups for the Railway platform, which has transitioned from a 'slow grind' to adding 100,000 users weekly. Early growth was driven by high-touch interaction on Discord and a determination to acquire the first 100 core users manually. This visual data serves as a transition into the company's history of scaling and its move toward becoming a primary cloud provider. > *so I just wanted to like pull up this glorious chart you say which is basically your usage or number of daily signups* > *[7, 34]* > *Trying to get those initial like first 100 users to like actually kind of come back to it.* > *[8, 21]* ## [10:11] Rebuilding the Business After the Free Tier At one point, Railway was losing $500,000 a month while only generating $50,000 in revenue, despite having $20 million in the bank. Cooper realized this was an unsustainable business model and chose to prioritize long-term viability over vanity metrics, temporarily closing the free tier to rebuild. The company now maintains a lean team of 35 people, preferring to build automated systems rather than throwing headcount at problems. > *We basically had to kind of close off the the free kind of users for a little while, rebuild the business.* > *[11, 47]* > *We're 35 people right now... we don't want to just like add headcount for the sake of headcount.* > *[10, 52]* ## [12:36] Agents as the Next Software Platform Over the last six months, Railway has prioritized 'agentic' development as the primary mechanism for building and deploying software. Cooper believes the industry is moving from assembly and high-level languages to 'words' as the primary interface. He envisions a future where thousands of agents run in parallel, requiring new tools for coordination and version control to manage the super-exponential growth of workloads. > *We've moved from assembly to C to C++ to JavaScript to now like words.* > *[13, 23]* ## [14:48] Railway’s Infrastructure Philosophy Jake Cooper explains that Railway prioritizes control over low-level primitives like network, compute, and storage to optimize for AI agent workloads. By avoiding Kubernetes in favor of custom orchestration, the team can place workloads with high precision to ensure memory efficiency. This level of control is necessary to prevent cost structures from ballooning as agent usage increases and requires thousands of parallel instances. > *you have to be very very efficient with these agents... or you're going to massively massively blow up your cost structure* > *[15, 10]* > *How do you get agents to coordinate? How do you go and get them to be able to like safely version changes?* > *[14, 28]* ## [17:01] Bare Metal, Cloud Economics, and the Compute Crunch Cooper describes the transition to bare metal as highly lucrative, reporting a payback period of just three months compared to cloud rental costs. This strategy allows the company to achieve 70% margins while leveraging hardware that remains viable for several years. He also notes the surprising appreciation of hardware assets, such as RAM, due to the global compute shortage and supply chain constraints. > *our payback period when we go to to metal... if we rent it in the cloud, our payback period is about 3 months.* > *[17, 2]* > *hardware and all of this stuff is... appreciated in value because RAM has gone up* > *[17, 50]* ## [18:41] Cloud Bursting and Five-Cloud Networking To maintain growth without being compute-constrained, Railway utilizes a hybrid cloud strategy for bursting capacity across AWS, GCP, and Oracle. This required building a custom network overlay capable of straddling five different cloud environments simultaneously. While this complexity led to past reliability challenges, it now allows Railway to scale rapidly regardless of individual provider quotas or hardware availability. > *I spent a weekend rebuilding our entire like network like overlay essentially so that we could straddle uh five different clouds* > *[19, 41]* > *we still maintain like cloud presence for like bursting essentially* > *[18, 52]* ## [21:39] Data Center Debt and Infra Financing Cooper highlights the strategic use of data center debt, secured against hardware, as a more efficient alternative to venture capital for infrastructure expansion. By treating compute capacity as a linear driver of revenue, Railway can scale as quickly as they can deploy new hardware. He encourages infrastructure startups to explore diverse financing tools rather than relying solely on expensive venture equity for physical assets. > *we can scale revenue as basically as quickly as we can scale compute* > *[21, 20]* > *our margins on metal are like quite high for the like 70%.* > *[20, 46]* ## [24:50] Data Centers in Space Jake Cooper and the hosts explore the technical challenges of placing data centers in space, specifically the issue of heat dissipation in a vacuum. Cooper expresses skepticism toward current proposals that ignore fundamental thermodynamic laws, comparing the 'figure it out later' mentality to science fiction. He highlights the difficulty VCs face in distinguishing between visionary ideas and technical 'grifts' in the space-tech sector. > *I haven't seen anybody like prove how you're going to go and dissipate that much heat in a vacuum* > *[25, 16]* > *how do you know what's like basically not possible and like is a grift versus like uh is possible but like sounds completely insane* > *[26, 16]* ## [26:43] What Agents Need From Infrastructure Cooper outlines the infrastructure needs of AI agents, noting they require versioning, observability, and storage similar to humans but at a 1000x scale. He predicts that current industry standards like Kubernetes and Envoy will become bottlenecks as agentic workloads compress development cycles. To support this growth, infrastructure must be modular enough to allow for the rapid replacement of failing components without human intervention. > *the workload profile doesn't change so much as it gets like massively massively compressed because you need to do thousands of these things* > *[28, 28]* > *you just need at a thousandx scale* > *[29, 13]* ## [29:43] CLIs, Canvas, and Agent-Native UX Cooper explains that while humans prefer simplicity, agents benefit from high-density CLI interfaces with numerous flags that serve as 'handles.' The Railway Canvas is also evolving into an output mechanism and 'context anchor' rather than just an input tool. This hierarchical view of infrastructure prevents critical knowledge from being siloed as teams scale complex 'hyperstructures' using automated agents. > *If you hand it to an agent and you say, 'Hey, that's 40 arguments and 600 flags.' Like, oh yeah, this is excellent.* > *[30, 35]* > *It has to be almost like an anchor for your context. It has to be like a port in the storm.* > *[34, 27]* ## [36:34] Central Station, Incidents, and Responsible Disclosure Railway utilizes an internal tool called Central Station to aggregate feedback and user context, moving away from static communication channels like Slack. The team emphasizes transparency by exposing real-time metrics and detailed incident reports, operating under a core value of 'honor.' This approach involves over-disclosing issues to users rather than providing vague or misleading information during outages. > *We'd rather overdisclose and know that you know that something is wrong versus almost like having your provider gaslight you.* > *[40, 22]* > *If you can dynamically aggregate that information and dynamically route it to the right person... this is no longer a manual process.* > *[37, 10]* ## [41:49] Safe Rollouts, SRE Agents, and Production Forks To mitigate the impact of bugs, Railway employs incremental rollouts and makes it easy to test behaviors in safe, shadowed environments. Cooper argues that production should not be treated as 'sacred' to the point of stagnation; instead, infrastructure should allow for trivial production forks. This is essential for AI agents, which face a 'stacking entropy' problem without safe iteration primitives to prevent system drift. > *We've built so much ceremony around like production is sacred... we need to get to a point where it's just trivially easy to test different behaviors.* > *[41, 33]* > *I think if you don't have the primitives to make iterating in production safe, it becomes very very difficult.* > *[44, 3]* ## [46:19] AI SRE, Specs, Code, and Tests Jake Cooper reflects on his transition from an AI skeptic to a believer, noting that the safety of AI SREs depends on infrastructure primitives. He advocates for the 'Holy Trinity' of software engineering: a clear specification, the code, and the tests. By aligning these three, developers and agents can reconcile discrepancies and maintain system integrity during rapid, automated iteration. > *If you just unleash an AI SRE on your production infrastructure... it's going to nuke your production database.* > *[46, 37]* > *You need three points essentially which is you need a clear spec... you need the code and then you need the tests.* > *[48, 22]* ## [49:43] Self-Replicating Infrastructure and the New Serverless The speakers explore the concept of agents using the Railway CLI to modify their own infrastructure, creating a self-replicating loop. This shift necessitates a move away from expensive, static virtual machines toward cheap, instantaneous 'atomic units of deploy' like isolates or sandboxes. The goal is to make throwaway copies of production as trivial and cost-effective as possible for agentic experimentation. > *The agent can like modify its own infra which I think is... yeah it's nuts.* > *[50, 4]* > *How do you go and make those throwaway copies like as trivial as possible to spin up run super cheap etc.* > *[50, 53]* ## [54:37] Heroku, Temporal, and Workflow Engines Cooper attributes the decline of Heroku to Salesforce's lack of focus on compute as a core business, leading to product stagnation. Railway positions itself as a 'fluid compute' provider, leveraging Cooper's decade of experience with Temporal (and its precursor Cadence) for durable workflows. Railway is a power user of Temporal, using it to manage complex, long-running infrastructure tasks at scale. > *The business of Salesforce is to build a really really good CRM... and then you acquire this business as a compute business that's kind of an offshoot* > *[55, 33]* > *I have used Temporal for almost like 10 years now, right? Because like Cadence, all of us other things.* > *[60, 5]* ## [1:05:26] Railpack, Nixpacks, and Lazy-Loaded Filesystems Railway is developing Railpack, an engine for determining source code dependencies, which evolved from their earlier Nix-based tool, Nixpacks. While Nix offers theoretical benefits for versioning, Railway found it caused significant image bloat and scaling issues for real-world workloads. They are now exploring content-addressable file systems to enable lazy loading of data into memory for faster deployments. > *If you want version X and version Y, you end up bloating a lot of your kind of like package like space.* > *[66, 2]* ## [1:07:20] Coding Agents, Token Spend, and Roadmap Acceleration With a monthly cloud spend reaching $300,000, Railway heavily incentivizes the use of AI coding agents among its employees. Cooper argues that manual code generation is an inefficient use of time, urging developers to focus on architectural patterns and code review. This allows the team to 'speedrun' their product roadmap by automating complex infrastructure tasks and test generation. > *If you are writing code by hand you are doing this wrong... you should be reviewing the code that you are writing.* > *[67, 37]* > *If you're not using the AI systems to almost like speedrun your road map... then you're kind of missing a large point.* > *[69, 12]* ## [1:12:15] The Pull Request Is Dying The traditional SDLC is undergoing a radical transformation where the pull request and manual code review are losing relevance. Impact is increasingly measured by the 'percentage of tokens that end up in production' rather than lines of code. As AI systems handle more reconciliation and validation, the focus shifts from the PR to the initial prompt and final deployment. > *The pull request is dying... it's going to be the prompt... and beyond that code review is also kind of dying.* > *[72, 23]* > *The really naive way to go in and measure this is almost like your percentage of tokens that end up in production.* > *[71, 40]* ## [1:13:47] Feature Flags and the Agent-Era SDLC Jake Cooper discusses the critical role of feature flagging in managing the 1000x compression of the SDLC driven by AI agents. He argues that incremental rollouts and blast radius management through flagging will become even more essential for safety as deployment speed increases. This culture of flagging allows for rapid experimentation without compromising system stability for enterprise customers. > *Everything's just going to get compressed by like a thousandx so that everybody can go and do that.* > *[77, 21]* ## [1:17:34] Cattle, Pets, and Cloning Machines Jake offers a contrarian view on the 'cattle not pets' philosophy, suggesting that snapshotting allows developers to treat infrastructure like 'pets' again. By snapshotting every frame and lazily loading file systems, the overhead of traditional DevOps tools like Dockerfiles is reduced. Railway even modifies the kernel to support persistent connections during these system snapshots. > *I think you can move towards having pets so long as... you have a cloning machine for your pets.* > *[78, 2]* > *If you can snapshot every single thing at every frame, then like it actually doesn't matter if you know that obliterated.* > *[78, 12]* ## [1:20:48] Solo Founder Lessons Jake reflects on his path as a solo founder, contrasting it with the Silicon Valley consensus of finding a co-founder. He emphasizes the need to be obsessed with every layer of the stack, from kernel-level changes to go-to-market strategies. He argues that having two co-founders can often lead to deadlocks without a clear tiebreak, whereas solo leadership allows for singular vision. > *Two is the worst number of co-founders is because you have no tiebreak... you basically are like, well, I disagree on this thing.* > *[82, 49]* ## [1:25:31] Focus, GPUs, and Building a New Cloud Railway is intentionally avoiding the GPU provider market for now to maintain its core mission, though Cooper admits GPUs are an inevitable part of their long-term roadmap. He stresses that companies are defined as much by what they choose not to do as by what they execute. The ultimate goal is full vertical integration to ensure a seamless experience from logic to execution. > *I think you're you're defined almost more by the things that you don't do than the things that you do* > *[86, 8]* > *I can tell you for a fact that we will not be doing GPUs now, but we 100% will be doing GPUs at some point.* > *[86, 50]* ## [1:29:39] Closing Thoughts Cooper reveals that Railway is moving toward 100% ownership of its data centers to avoid copying the infrastructure of legacy hyperscalers. By inventing their own infrastructure from scratch, Railway aims to support 'vibe coding,' where the friction between a thought and a live application is completely removed. This approach empowers a new generation of 'citizen developers' to build at the speed of thought. > *there should be no friction in between what your thought is and reality that kind of comes out.* > *[89, 4]* > *we've been very very deliberate to like invent our own infrastructure from scratch.* > *[88, 30]* ## Entities - **Jake Cooper** (person): CEO and 'Conductor' of Railway. - **Railway** (organization): A cloud platform designed for easy deployment and environment management. - **Uber** (organization): Jake's former employer where he worked on distributed systems for Jump bikes. - **Temporal** (software): A workflow orchestration platform used by Railway for reliable infrastructure tasks. - **Salesforce** (organization): The CRM company that acquired Heroku, leading to its perceived stagnation. - **Heroku** (organization): A pioneer PaaS platform that Railway is often compared to. - **AWS** (organization): Amazon Web Services, used by Railway for hybrid cloud bursting. - **GCP** (organization): Google Cloud Platform, one of the five clouds Railway straddles. - **Claude** (software): An AI model mentioned as an interface for deploying on Railway. - **GitHub** (organization): A code hosting platform discussed regarding its architectural flaws in versioning. - **Kubernetes** (software): An orchestration system Railway chooses to avoid for higher-order control. - **Central Station** (product): Railway's internal tool for aggregating user context and support feedback.

Ukraine produced 4 million FPV drones last year; China could produce 4 billion. That asymmetry frames two hours of unusually concrete conversation between Yaroslav Azhnyuk — serial tech founder turned AI-drone builder at The Fourth Law — and economist Noah Smith, who has been writing about the economics of drone warfare since before most Western policy circles took it seriously. They cover the full tech stack (cameras, autonomy modules, fiber optic links, interceptors, a semiconductor fab under construction), a five-level autonomy taxonomy, an eight-dimension autonomous-battlefield framework, and China's manufacturing edge that has no near-term Western answer. The through-line: the West is still planning to fight the last war, Ukraine is the defense valley where the next war is already live, and the gap is widening faster than most people realize. ## [00:00] Cold Open: China's 4 Billion Drones and the Cameras-to-Explosives Pipeline Yaroslav opens cold with a single arithmetic comparison that structures the rest of the episode. Ukraine, not an industrial powerhouse, built 4 million FPV drones in a year. China, with an order-of-magnitude larger manufacturing base and a consumer electronics supply chain already producing the same cameras, motors, and chips, could produce 4 billion. Noah immediately asks whether that makes China the supreme conventional military power on earth right now. Yaroslav won't claim certainty, but won't rule it out either. > *"I don't think we have all the information to claim that, but we cannot count it out. And that alone should be, you know, a big warning sign."* The cold open also plants the personal pivot that the rest of the episode unpacks: Yaroslav went from making cameras that fling treats to pets to cameras that fling explosives to occupiers. ## [01:04] Introduction: Brandon, Noah Smith, and Yaroslav Azhnyuk Guest host Brandon normally runs a science podcast; this episode is the exception. Noah Smith — Noahpinion Substack, economist focused on industrial policy and geopolitics — is co-host and co-interviewer. Yaroslav sets the personal context: on February 23rd, 2022, he and his then-fiancée landed in Kyiv at 11 p.m. on what turned out to be one of the last flights into the city. Eight hours later, the bombs fell. The 17-hour drive west that followed — empty streets, gas stations out of fuel, pouring diesel into windshield-washer canisters — reads like a scene from an apocalyptic film because, for the people living it, it was exactly that. > *"We basically packed our belongings and got in the car and spent 17 hours riding west. That was exactly like that. I, you know, missiles are falling, like there was smoke in Kyiv."* ## [05:41] From Tech Entrepreneur to Defense: PetCube, Brave One, and the D3 Fund Yaroslav's path from pet-tech to defense wasn't a straight line. In San Francisco from 2014 to 2020 building PetCube (one of the leading pet-camera companies), he had never taken military coursework and considered wars a thing of the past. Day one of the invasion he knew he would fight back with everything he could — but weapons weren't the first instinct. Early efforts included lobbying U.S. Congress on Lend-Lease (passed May 2022, underdelivered), co-founding Brave 1 (Ukraine's defense-innovation cluster, analogous to DIU), and helping seed the D3 Fund co-started by Eric Schmidt. By 2023, two things became undeniable: the war would last, and drones had permanently redefined warfare — the first software-defined weapon platform in history, where a battlefield capability upgrade can be pushed overnight like a software update. > *"It's like if you were able to push a software update and get all of your Roman legionaries a new helmet. That has never been possible before."* ## [10:42] The Ethics of Building Weapons: Dual-Use Technology and the Wolf at the Door Brandon raises the dual-use problem: the technology won't stay in Ukrainian hands. Yaroslav's answer is pragmatic rather than philosophical. Every technology from fire to large language models is dual-use; the question for a maker is whether the marginal risk of their contribution outweighs the immediate need. Ukraine is in a forest with a wolf. You deal with the wolf first, then consult Greenpeace. He's clear-eyed that no technology stays contained — the parallel concern about LLMs freely available in North Korea and Russia applies equally to drone autonomy — but frames his own company's responsibility narrowly: they supply to the Ukrainian government and armed forces, not to arbitrary buyers. > *"When you're in a situation where you're in a forest in front of a wolf, you know, you first going to deal with a wolf that wants to eat you and then you're going to go consult Greenpeace."* ## [14:01] The Tech Stack: Cameras, Autonomy Modules, Interceptors, and a Semiconductor Fab The Fourth Law's structure is three interlocking business units. Cameras (daytime and thermal, sold to 200+ Ukrainian drone manufacturers). Drone autonomy modules (sold to the same ecosystem). And UAV products sold direct to the armed forces: FPV strike drones, bombers, Shahed interceptors, and ISR interceptors — drones that hunt Russian reconnaissance drones before they can relay targeting data. The thermal-camera arm is about to start construction on two semiconductor fabs to manufacture sensor chips in-house, driven by the realization that dependence on foreign sensor supply chains is a strategic vulnerability. > *"We're about to start construction of two semiconductor plants to make sensors for thermal cameras. That's super exciting for me as a computer science guy — doing semiconductor, super cool."* ## [18:47] Fiber Optic vs. AI: The Radio Horizon Problem and $32/km Cable The chapter is really about why radio-only FPV drones fail at long range — not just from jamming, but from the curvature of the Earth. Below roughly 60-100 meters altitude at 30-40 km range, a drone enters a radio shadow behind hills, forests, or the horizon itself. The pilot loses video and control precisely when closing on a target that is, by definition, on the ground. Fiber optic cable ($32/km, spooled from the drone) solves the shadow problem but adds weight, limits range, and reduces maneuverability. AI fills the gap differently: terminal guidance lets the drone complete the last few hundred meters autonomously even after the radio link breaks. The two approaches aren't mutually exclusive — you can run AI on top of a fiber optic link to command hundreds of drones with fewer operators. > *"If your drone goes low — and usually Russian infantry and vehicles, they're on the ground and you want to hit them, you need to go low — lower you go, maybe you'll get behind a hill or behind a forest, and if you're far enough you'll just get behind the curvature of the Earth."* ## [25:32] FPV Drones: The New God of War — 70–80% of Frontline Casualties Artillery was historically called "the god of war" because it caused 80% of battlefield casualties. On the current Ukrainian front line, 70-80% of casualties are inflicted by FPV drones — the same fraction, a different weapon. Tanks, designed to dominate land warfare for decades, are now routinely destroyed by $400 consumer-grade quadcopters because armor was never built to defend against attacks from directly above. The trajectory follows the same curve as calculators becoming irrelevant once smartphones arrived: not a linear substitution but an exponential displacement where the new technology's influence grows nonlinearly. > *"They used to say that artillery is the god of war because artillery used to cause like 80% of casualties, and now on that ranking FPV drones rule."* ## [28:28] The Five Levels of Drone Autonomy: From Terminal Guidance to Full Autonomy Yaroslav lays out five autonomy levels describing where the field stands and where it's heading. Level 1 is terminal guidance — the drone flies under human control and locks onto a target only in the final seconds. Level 2 is bombing — dropping munitions from altitude without directly ramming a target. Levels 3-4 introduce increasing target-selection and navigation independence: the drone can identify radio-emitting equipment, track vehicles, or navigate through GPS-denied environments. Level 5 is full autonomy — launch-and-forget, no human in the loop for any mission phase. Current battlefield deployment sits mostly at Levels 1-3. The jump to higher levels isn't primarily a technical problem anymore; it's a deployment, doctrine, and trust problem. Human confirmation remains in the loop at every stage involving lethal targeting decisions — for now. > *"Technology progresses and its influence grows nonlinearly. It's all exponential."* ## [41:37] The Eight Dimensions of the Autonomous Battlefield The five autonomy levels describe a single drone's capability. The eight dimensions describe the full battlefield context those drones operate in. Dimension 1: level of autonomy (the five-level scale). Dimension 2: platform type (quadcopter, fixed-wing, missile, naval drone). Dimension 3: environment (day/night, urban/forest/open terrain). Dimension 4: target type (moving vehicle, static structure, radio emitter). Dimension 5: swarm size and coordination. Dimension 6: command-and-control architecture. Dimension 7: sensing modality (optical, thermal, RF). Dimension 8: infrastructure (simulation, data pipelines, security, deployment tooling). Each dimension interacts with every other. A Level-4 autonomous drone performing well in open daylight terrain may fail completely in a forest at night. Battlefield AI systems have to be evaluated across all eight dimensions simultaneously, not just on the single axis of autonomy level. > *"I say dimension because each of them works with another. It's crucial to understand how autonomy evolves in a modern battlefield environment."* ## [45:32] AI Safety and the Morality of Autonomous Weapons Yaroslav's position flips the standard AI-safety framing: in five to ten years, it will be *immoral* to use weapons *without* AI, because human-only weapons produce more collateral damage and friendly fire. He draws the analogy to manually driven cars — once autonomous vehicles are the norm, letting a human drive on a public road becomes the dangerous choice. Noah pushes to the logical endpoint: a Level-6 "AI general" — one large model that ingests all battlefield data and agentically selects targets, with humans reduced to repairing drones. Yaroslav says technically it could be done now. The constraint is deployment and trust, not capability. He references what was publicly described about AI-assisted target designation in the Iran operation: AI surfaces 127 targets, human reviews the list and presses okay. That's already close to an AI general with a rubber-stamp layer. > *"I think 5 to 10 years from now it will be immoral to use weapons without AI because weapons without AI will be more likely to cause collateral damage or unwanted damage."* ## [51:31] The End of the Rifleman? Noah's 2013 Prediction vs. Battlefield Reality Noah revisits a prediction he made in 2013: the rifleman is obsolete, replaced by standoff weapons. Ukraine both confirms and complicates it. FPV drones have unquestionably displaced the rifle as the primary instrument of attrition — but infantrymen haven't disappeared. They dig trenches, hold terrain, conduct logistics, and survive for months in dugouts under continuous drone threat by adapting: better camouflage, smaller movement signatures, drone-awareness drills. Yaroslav extends the timeline question to humanoid robots. The world is built for bipedal humans; there's genuine utility in a platform that can operate a rifle, open a door, or crew a vehicle. He puts a Terminator-style scenario — humanoid combat robots — at 10 years out, not science fiction. But modern warfare, they agree, is a multi-dimensional problem — dozens of drone types, land ops, reconnaissance, psychological operations, aviation, tanks, logistics — and the press focus on whichever technology is newest understates how much every layer still matters. > *"Modern warfare is really very complex and the fact that drones are the latest coolest thing doesn't mean that now it's that and only that."* ## [01:05:13] China's Manufacturing Advantage and Western Vulnerabilities This is where Noah Smith's economics background drives the conversation. The U.S.-China drone comparison isn't about unit price or autonomy level — it's about manufacturing throughput at scale. China's consumer electronics supply chain already produces the motors, cameras, chips, and battery cells that go into FPV drones. Switching that capacity to military production requires regulatory will, not retooling. Ukraine builds fixed-wing drones with 10 km range from hobby components; China can build fixed-wing drones with 200-300 km range at the same cost curve. The West's vulnerability isn't just quantity. It's thermal cameras (overwhelmingly sourced from China), semiconductor fabs (two generations behind on drone-relevant sensors), and procurement speed (a Western defense contract takes years to award; Ukraine iterates weekly). Yaroslav is optimistic about Western human capital — the engineers exist — but openly frustrated with European institutional inertia and uncertain about whether the U.S. has fully absorbed the lessons from Ukraine and the Middle East. > *"We don't have all the information to claim that, but we cannot count that out. If we want to keep the resemblance of our good past life, we have to do something about it."* ## [01:24:21] Policy Advice for Western Defense: Defense Valley and the Widening Gap Yaroslav's top policy prescriptions are framed around the William Gibson quote he attributes to Arthur C. Clarke: the future is already here, just not evenly distributed. Kyiv is Defense Valley — the place where the future of war arrived first, with hundreds of specialized companies, battle-tested commanders at every rank, and a government that learned to move at startup speed. Priority 1: deep integration with Ukraine's defense ecosystem, not just procurement but embedded learning. Priority 2: procurement reform — the drone-dominance initiative is the right direction and needs to scale 10x. Priority 3: long-range drone readiness for contested maritime environments (Shahed-class drones with 2,000 km range cover the entire Pacific island chain). He worries that the U.S. learned less from Ukraine than it should have and may be repeating the pattern with Iran. > *"Kyiv and Ukraine is sort of the defense valley. It's the point where the future of defense has already arrived, and there's a ton of things to learn from that."* ## [01:32:54] The Drone Race: Who's Ahead, Category by Category Russia was at parity or ahead in drone capability 18 months ago; Ukraine has since pulled ahead on FPV and autonomy. But Russia has a 4x population advantage and significantly more industrial capacity than Ukraine alone — scale disparity is why Western supply matters. The race breaks down by category: FPV strike (Ukraine leads), ISR reconnaissance (contested), glide bombs (Russia leads, dropping from bomber aircraft at scale), deep-strike drones (Russia leads on volume), and interceptors (Ukraine innovating rapidly, Russia catching up). Russia uses helicopters to intercept Ukrainian deep-strike drones — a costly but effective countermeasure revealing how each new offense spawns a tailored defense, at weekly iteration cycles. > *"Everyone says Russia's behind right now in the drone war. But that wasn't true a year ago."* ## [01:41:57] Countermeasures: Shotguns, Jammers, Lasers, and Fishnets Shotguns work — they're the primary kinetic countermeasure against incoming FPV drones — but only for a trained soldier who can hit a 20 cm target moving at 100 km/h under combat stress. Electronic jammers are the most widespread defense: block the radio or GPS link and the drone loses guidance. The catch is that the same spectrum the jammer blankets is often used by your own forces, and jammers are being defeated by frequency-hopping and fiber optic links. Russian tanks now look like porcupines — improvised metal cages and electronic-warfare antennas bolted on top to defeat top-attack drones. Ukraine's answer is shaped charges specifically tuned for the gap between the cage and the hull. Lasers are effective but expensive ($10M+ per system to kill a $400 drone) and slow to slew onto fast-moving targets. Fishnets — literally mesh nets — are being deployed around static positions because they're cheap, snag rotors, and require no power. > *"Then the tanks — if you look at Russian tanks and sometimes Ukrainian tanks or equipment — they all look like porcupines."* ## [01:58:19] The Wedding and Final Takeaway: Be Prepared for War Brandon closes with two questions. First: did Yaroslav actually get married in that chapel on February 23rd? They got legally married, but postponed the reception until the war is over. Second: one takeaway for the audience. Yaroslav's answer is a restatement of the Roman proverb: *si vis pacem, para bellum*. > *"You want peace, be prepared for war. Got to invest in defense and security."* ## Entities - **Yaroslav Azhnyuk** (Person): Founder of The Fourth Law (AI drone autonomy + thermal cameras, Ukraine); previously co-founder of PetCube; co-founder of Brave 1 and D3 Fund; born and raised in Kyiv. - **Noah Smith** (Person): Economist; author of the Noahpinion Substack; co-host for this episode; focus on industrial policy, manufacturing economics, and geopolitics. - **Brandon** (Person): Regular Latent Space host (science podcast background); guest host for this episode. - **The Fourth Law** (Organization): Yaroslav's AI-guided drone company; three business units — thermal cameras, drone autonomy modules, UAV products (FPV strike, bombers, interceptors). Leading drone-AI team in Ukraine. - **PetCube** (Organization): Consumer pet-camera company Yaroslav co-founded in San Francisco (2014–2020); the origin of the "cameras that fling treats / cameras that fling explosives" pivot. - **Brave 1** (Organization): Ukraine's defense-innovation cluster; analogous to DIU (Defense Innovation Unit) in the U.S.; co-founded with Yaroslav's involvement. - **D3 Fund** (Organization): Defense-tech investment fund co-founded with Eric Schmidt (ex-Google CEO) to accelerate Ukraine's drone ecosystem. - **FPV Drone** (Concept): First-Person-View drone — pilot sees through onboard camera in real time; currently responsible for 70-80% of frontline casualties; dominant tactical weapon of the Ukraine conflict. - **Five Levels of Drone Autonomy** (Concept): Yaroslav's taxonomy from terminal guidance (Level 1) to full autonomous operation (Level 5); most current battlefield deployment is Levels 1-3. - **Eight Dimensions of the Autonomous Battlefield** (Concept): Yaroslav's framework for evaluating drone systems across platform type, environment, target class, swarm scale, C2 architecture, sensing modality, and infrastructure. - **Defense Valley** (Concept): Yaroslav's term for Kyiv/Ukraine as the global hub where the future of defense tech is already live — analogous to Silicon Valley for consumer tech. - **Radio Horizon** (Concept): Earth-curvature effect that cuts radio/video links to low-flying FPV drones at 30-40 km range; primary technical driver for fiber optic drone adoption. - **Shahed** (Concept): Iranian-designed loitering munition used by Russia; fixed-wing, up to 2,000 km range; archetype for long-range drone threats to Western bases and Pacific-scenario planning.

Abridge's Janie Lee and Chai Asawa join swyx and Redpoint's Jacob Effron for a Latent Space × Unsupervised Learning crossover on how an AI scribe grew into healthcare's "clinical intelligence layer". They walk through the air-conditioning product philosophy, the prior-authorization use case, an eval stack built around clinician-scientists and LLM judges, why HIPAA reshapes the data flywheel, and what it takes to run reliably across 100M+ medical conversations. ## [00:00] Introduction The episode opens with Janie Lee's pitch — context is everything, alerting should go from reactive to proactive, and the product itself should fade into the background like air conditioning until a clinical risk warrants action. swyx then breaks in with a brief listener appeal to subscribe instead of taking on ads. > *"One thing we like to say is we want our product to feel like air conditioning. It should be in the background just making things better."* — Janie Lee ## [01:17] What Abridge does swyx frames this as the annual Latent Space × Unsupervised Learning crossover, with Jacob Effron joining because Redpoint is an Abridge investor. Janie introduces Abridge as a clinical intelligence layer for health systems, starting from documentation: clinicians spend 10–20 hours a week writing notes, and the patient-clinician conversation sits upstream of almost every downstream artifact — the claim, the payment, the diagnosis. Chai adds that everything before, during, and after the visit becomes addressable once you have full context on patients, payers, guidelines, and the literature. > *"Uh Bridge is a clinical intelligence layer for health systems. We really started with documentation and building for clinicians."* — Janie Lee ## [03:22] From ambient documentation to clinical intelligence Janie traces Abridge's three "acts": save time (the original scribe product that gave doctors back their evenings — "pajama time"), save and make money for health systems running on record-low operating margins, and ultimately save lives. The fact that the product is opened millions of times a week, before, during, and after each visit, is what makes the expansion feasible. > *"They call it pajama time… doctors after work in their pajamas at home or just writing and catching up on their notes every day."* — Janie Lee ## [05:21] Clinical decision support and context as king Jacob asks Chai how Abridge's clinical decision support compares to his previous work at Glean. Chai contrasts the two: at Glean a wrong answer is annoying; in healthcare it's high-stakes and the user surface is much narrower — fewer personas, but every output has to land. That shapes everything from offline evaluation to progressive rollout, and ties back to the Jarvis-style "assistant that actually knows you" vision every hackathon for the last decade has tried to build. > *"you know the Jarvis vision that like every hackathon I went to over the past decade — there was always a Jarvis competitor but I actually think a bridge very much started from the opportunity and continues to go that way."* — Chai Asawa ## [08:14] Alert fatigue, proactive intelligence, and prior authorization Jacob raises the classic alert-fatigue problem: how do you decide when to break the air-conditioning quiet and actually interrupt? Janie's worked example is prior authorization — an MRI rejection that today arrives weeks later can be turned into a real-time prompt while the patient is still in the room, conditioned on payer policies, EHR data, prior diagnoses, and clinic-specific protocols. The catch is the data plumbing: prior auth only works if the assistant can stitch every relevant signal together at the right second. > *"I think like one to make that prior authorization example possible, think about all the data that you need to have."* — Janie Lee ## [13:53] Ambient AI form factors and healthcare customers swyx asks about form factors. Today the main surface is mobile, but Abridge also runs on desktop, browser plugins inside the EHR, in-room devices for inpatient settings, nursing workflows, and is starting to look at AR. The customer is multi-sided: CMIOs, CFOs, CIOs, clinicians, patients, payers, and pharma all sit somewhere in the loop, with payer interactions happening through structured exchange rather than direct visibility into raw Abridge data. > *"You guys talk a lot about ambient um AI. Uh is it primarily on the phone?"* — swyx ## [18:16] The hardest AI problems in healthcare Asked for the single hardest AI problem at Abridge, Chai picks high-quality, low-latency, low-cost real-time support in a high-stakes clinical setting. Modeling the long tail of payer policies into intermediate representations the system can reason over is one specific example — the Pareto frontier keeps moving, and they have to push it themselves rather than wait for off-the-shelf gains. > *"Um and of course the parado frontier is always changing but we're also trying to do this now."* — Chai Asawa ## [19:43] Frontier models, proprietary data, and model strategy Jacob asks what they take off-the-shelf vs build. Chai's framing: frontier models keep absorbing general healthcare knowledge, so Abridge's edge sits in the proprietary medical-conversation data and the specialty-specific behavior built on top. They're explicitly model-agnostic where they can be — what matters is the end product experience, and they mix and match per workflow. > *"we can use something for this that and like we only care about at the end of the day the best product experience."* — Chai Asawa ## [22:24] The EHR as a filesystem for agents Chai's framing for the next year: every agent is a coding agent underneath, and inside healthcare the EHR functions as the filesystem — a giant store of structured information that won't fit in any current model's context window. Janie adds that the goal is still to keep the clinician focused on the patient: have the right context ready at the right second, not to relitigate the conversation. > *"almost every agent is a coding agent underneath underneath the hood right so you you give it whatever a file system it can write its own code… you can think of the EHR effectively like a file system."* — Chai Asawa ## [25:20] Personalization, memory, and clinician preferences Jacob asks how Abridge handles per-doctor personalization. Janie's answer is layered: individual edits become signal, specialty-specific defaults sit on top, and health-system policies wrap everything. Chai talks about memory as a new kind of system of record — background jobs that consolidate signals across visits, similar to how sleep consolidates memory in humans, so the model "learns" from every edit and every non-edit. > *"part of the other interesting exhaust for us is like memory is like actually one of these new systems of records almost"* — Chai Asawa ## [31:57] Evals, LLM judges, and progressive rollout Janie walks through the eval stack: in-house clinicians run an "LFD" first-pass review, LLM judges are calibrated against that annotated data, third-party evaluators provide an independent read, and specialty-specific evals catch what generic ones miss. Chai adds a self-driving-cars analogy — they want contact with reality fast, but only through progressive rollout, so the offline distribution actually matches the production distribution. > *"I want to make contact with reality as quickly as possible but I want a progressive roll out because as much as… of offline eval set I want the distribution of that to actually match real life distribution"* — Chai Asawa ## [38:04] HIPAA, de-identification, and privacy Privacy is treated as a hard constraint on the data flywheel. Chai explains that anything used as the basis of online evals or learning has to be de-identified, one-way — they have engineered processes around that. Janie adds that customer contracts also gate who inside Abridge can access PHI, so the bar for what flows back into training data is contractually high, not just policy-high. > *"any of the data we use needs to be deidentified any real world data we use as a basis of um online eval sets or learning from and so you have to"* — Chai Asawa ## [40:38] 100M conversations and operating at scale At 100M+ conversations the surface area shifts: model routing, post-training, reliability budgets, and cost per call all become first-class concerns. Chai talks about insights you can surface to clinicians, and stretches the timeline forward — eventually the same conversation could power signals to patients and consumers directly, not just providers. > *"there's so much in our data set of a 100red million conversations. You you can imagine things like insights that you can give to the clinician."* — Chai Asawa ## [45:27] EHR integration and the clinical intelligence layer swyx asks about the EHR relationship. Abridge invests heavily in deep interoperability — the EHR partnership is table stakes for clinician adoption, but the value Abridge layers on top sits at a different scope: cross-visit context, payer-aware reasoning, and the kind of clinical intelligence the EHR itself isn't structured to produce. > *"one one of the key partners is the EHR and I I wonder what that relationship is like"* — swyx ## [47:56] Healthcare regulation, latency, and high-stakes AI Jacob asks what Abridge has learned from regulation. Janie's answer pushes back on the usual narrative — healthcare AI actually has regulatory tailwinds, because the bar is so high that the hardest problems end up getting solved here first. Chai talks through the "clever tricks" they ship today knowing the frontier will keep moving, and accepting that some of those tricks won't survive five years. > *"I think it's where some of the hardest AI problems will get solved first just because the bar is so high."* — Janie Lee ## [51:28] Clinician scientists and long-tail quality Janie describes a role internal to Abridge called the clinician scientist — MDs who are also technical, ranging from full-stack engineers to "extremely scrappy prompters." Having them embedded in product and eval teams raises the bar on what gets shipped, because the people writing the LFD criteria are the ones who actually understand what clinically useful means. swyx connects this to active learning on known weak spots — the kind of polish that's a lost art in most AI shops. > *"we have this role called the clinician scientist and I think I heard one of our leaders refer to them as mutants recently"* — Janie Lee ## [54:21] Lessons from Glean and durable AI infrastructure Jacob asks Chai what carries over from Glean. The answer is mostly about what holds up over time — context layers, event-driven systems, Kafka, Temporal, sockets, CRDTs from the Google Docs collaboration playbook. Multi-agent systems inherit the same conflict-resolution problems humans have, and the infra patterns from the last decade aren't being discarded, they're being repurposed. > *"there's a lot of event-driven technology… whether it's Kafka temporal sockets and so forth how do you bring that together is I think actually also durable"* — Chai Asawa ## [58:20] The future of agentic healthcare workflows A short exchange on what a more agentic Abridge looks like: still anchored on the clinician's role in the patient relationship, but with more background work — reacting to labs, drafting follow-ups, taking on capabilities on behalf of the clinician without taking over the relationship. > *"even more capabilities on behalf of the clinician who we believe has a super important role to play in terms of um patient connection and so forth."* — Chai Asawa ## [58:51] PRDs, product clarity, and building serious AI products Jacob's quickfire: what have you changed your mind on in AI in the past year. Janie flips the popular take — prototypes are not the end-all, PRDs are not dead. As products get more complex and AI-powered, the written-clarity discipline of a real PRD matters more, not less. The rest of the section is on building serious AI products in healthcare: ownership, written spec discipline, and resisting demo-driven development. > *"the hotter take is that prototypes are the end all be all and that purities are dead."* — Janie Lee (the take she changed her mind on) ## [64:28] AI coding tools at Abridge swyx's standard outro question. Abridge uses Claude Code and Cursor internally, and Jacob throws in a half-joking benchmark — he'd like to see Claude run a $1B pre-revenue company. > *"Claude's going to do this like I'd like to see Claude… go do a company at a billion dollars pre-revenue"* — Jacob Effron ## [65:23] Outro Chai points listeners to Abridge's website for their white papers — hallucination reduction, evals, and the rest of the research stack. swyx and Jacob wrap with thanks and closing pleasantries. > *"on our bridge website, we have a lot of our white papers where we've done a lot of interesting work such as like uh, reducing a hallucination."* — Chai Asawa ## Entities - **Janie Lee** (Person): Co-founding-era operator at Abridge; product / commercial side of the clinical intelligence layer. - **Chai Asawa** (Person): Abridge clinical decision support lead; previously at Glean. - **swyx** (Person): Host of Latent Space. - **Jacob Effron** (Person): Partner at Redpoint Ventures; host of the Unsupervised Learning podcast. - **Abridge** (Organization): Healthcare AI company building the clinical intelligence layer — started with ambient documentation, now expanding into decision support, prior authorization, evals, and EHR integration. - **Glean** (Organization): Enterprise AI search company; referenced as Chai's prior workplace and a horizontal-vs-vertical contrast to Abridge. - **Redpoint Ventures** (Organization): VC firm; Abridge investor and the home of the Unsupervised Learning crossover. - **EHR (Electronic Health Record)** (Concept): The system-of-record health systems run on; Chai's framing — the EHR functions as a filesystem for healthcare agents. - **Prior authorization** (Concept): A core Abridge use case — turning weeks-long payer rejections into real-time guidance during the visit. - **LFD process** (Concept): Abridge's internal clinician-led first-pass review used to calibrate LLM judges and define eval criteria. - **Clinician scientist** (Concept): An Abridge role — MDs who are also technical, embedded in product and eval teams. - **Progressive rollout** (Concept): Abridge's deployment discipline; ship to a slice of real traffic to keep the offline distribution honest, modeled on self-driving's release pattern. - **Claude Code** (Software): AI coding tool used internally at Abridge. - **Cursor** (Software): AI coding editor also used internally at Abridge.

Matt Pocock joins swyx at AI Engineer Europe to argue that the old software design canon — DDD, deep modules, ubiquitous language — matters more, not less, in the AI coding era. The thesis: code is not just a compile target; a codebase that is easy for humans to change is easy for AI to change. Along the way they cover course-making, why traditional lectures still beat AI-native learning, and TypeScript's quiet takeover of AI engineering. ## [00:04] Opening at AIE Europe and the Cursed Course swyx welcomes Matt to the AI Engineer Europe podcast booth in London. Matt jokes that AIE is "the worst" event he has ever attended (the location is in fact astonishing) before turning to his Claude Code course, which is just wrapping up its two-week cohort. He explains why he runs short cohorts: AI moves so fast that self-paced courses cannot guarantee updates, and the "curse" of releasing into breaking changes — AI SDK v5 dropped on day two of his AI SDK v4 course, and the Claude Code source leaked during this one — is now baked in. The conversation then turns to teaching as a craft. Matt rejects the "pundit" branch of YouTuber identity — he is not trying to predict the future, only to teach durable material — and notes that being a teacher first is what differentiates his content. > *I'm not a guy who's trying to predict the future. I'm just trying to teach.* ## [02:51] Why Engineering Fundamentals Matter More with AI Matt previews his AIE talk. The popular narrative says code no longer matters because English plus an AI compiler can produce applications. Every time he tried to ignore the code, he ended up with "a terrible mess." So he went back to the classics — *Extreme Programming*, *The Pragmatic Programmer*, *A Philosophy of Software Design*, DDD — and discovered they ported directly into prompts. Keeping the architecture in your head, even when you delegate implementation, yields outsized dividends. > *If you have a code base that's easy to change for humans, it's going to be easy for AI to change, too.* ## [04:23] Narrow Waist and Deep Modules swyx introduces the "narrow waist" concept from internet architecture (TCP/IP, HTTP at layers 3–4) as a way to contain AI-generated slop: define rigid interfaces, delegate the inside. He extends it to running AIE as a nine-person business — "model-view-claw" instead of MVC, where coordination across people and AI is the real systems problem. Matt maps this onto John Ousterhout's notion of *deep modules*: a large amount of functionality behind a simple interface, ports and adapters style. This is, in his experience, the best way to use AI for coding — be intentional about the interface as a human, then delegate the implementation. > *Deep modules basically — a large amount of functionality with a simple interface. Kind of ports and adapters, right?* ## [06:37] Domain-Driven Design Meets AI DDD is having a moment, and Matt argues it works *because* the framework has been around long enough to sit in the latent space of these models. You do not have to invent new vocabulary; you can bolt on a system that is composable and that the model already understands. The deeper point: DDD is fundamentally about aligning code with language, which is exactly what you want when speaking to an AI. He makes it concrete with the `mattpocock/skills` repo (≈13k stars) and its "ubiquitous language" skill — a Claude Code skill that scans your codebase, surfaces the arcane jargon, and refines it with you into a markdown file he keeps open while prompting. He references it from `agents.md` but does not paste it wholesale, so the agent finds it when searching for those terms. > *Essentially, you're trying to create a unified domain model so that the AI and you are speaking the same language.* ## [10:05] Teaching as an Overpowered Skill swyx asks how Matt got so good at explaining things. Matt credits six years as a voice coach before becoming a developer — communication felt like an unfair advantage when he started as a junior. He has since narrowed his focus: split time between learning material and finding the right phrases for it. The old texts help because they give him pre-built mental models to explain new ideas through. He walks through his course-making process: an "explore and exploit" phase, a Zettelkasten-style Obsidian vault, a custom planning app, P1/P2/P3 prioritization, and the rule that *each lesson teaches exactly one thing* with dependencies made explicit. Most of what he produces ends up on the cutting room floor. > *The ability to communicate always just felt like a ridiculous overpowered skill that I had in my locker that no one else had.* ## [13:20] How People Actually Learn AI Engineering The conversation turns to whether AI has changed how people learn. Matt distinguishes knowledge (lectures), skills (interactive exercises), and wisdom (small-group discussion — and now, talking to an AI). Counterintuitively, the more he leans into AI-experimental teaching, the more it turns his audience off. Most learners still want traditional lectures; swyx recalls Maven's cohort-based education arc landing in the same place. Matt's compromise is to force the work without forcing the form: in his TypeScript material he throws learners into a problem first and gives them the knowledge afterwards. > *The more I lean into the kind of AI experimental stuff, the more it actually turns people off my materials.* ## [15:04] TypeScript Overtaking Python swyx flags that TypeScript overtook Python in the GitHub survey this year — a shift he did not see coming, particularly in AI engineering where Python's expressiveness has been dominant on the backend. Matt's echo chamber is 100% TypeScript, but his real argument is ecosystem: when you care about UX and shipping chat-style applications, the framework gravity is in TypeScript (Vercel's Next.js, Cloudflare's variants). swyx admits this would meaningfully change which frameworks he promotes. > *If you're concerned about UX, concerned about shipping great stuff, you're mostly doing it in TypeScript.* ## [16:45] Inversion of Control and Composable Skills Matt looks ahead. His TypeScript-evals bet (Everlight) stalled — "no one's excited to do evals." The next frontier is *inversion of control*: as coding agents converge on similar architectures (Firebase-style backends, small tool sets), the interesting axis becomes how much control sits with the developer versus the harness. Claude Code's opacity buys ease of use but loses observability; Pydantic AI ("Pi") swings the other way — total control, total maintenance burden. He closes by pointing past coding agents entirely. Software engineers are a step ahead because AI produces quality output in their domain, but the composable skills he authors — like his three-sentence "grill me" skill that makes the AI interrogate you until you reach a shared understanding — generalize to any domain where you want the AI aligned with you. > *The inversion of control is going to be really important — you put more control in the hands of the developer and less in the harness.* ## Entities - **Matt Pocock** (Person): Creator of Total TypeScript and AI Hero; teaches TypeScript and AI Engineering through two-week cohort courses. - **Shawn Wang / swyx** (Person): Host; founder of AI Engineer and the AIE conference series. - **AI Engineer Europe (AIE)** (Organization): The London conference where this conversation was recorded; Matt's talk hit 1M views in 13 days — fastest in AIE history. - **AI Hero** (Organization): Matt's AI engineering education platform (aihero.dev). - **Claude Code** (Software): Anthropic's coding agent; subject of Matt's just-finished course and a recurring example throughout. - **Domain-Driven Design (DDD)** (Concept): Software methodology centered on aligning code with the language of the business domain; Matt argues it ports cleanly into AI prompting. - **Ubiquitous Language** (Concept): DDD practice of maintaining a shared vocabulary doc; Matt's namesake Claude Code skill scans a repo and refines this with the user. - **Deep Modules / Narrow Waist** (Concept): Architectural pattern (Ousterhout / internet protocols) of large functionality behind a small interface — Matt's preferred shape for AI-assisted codebases. - **mattpocock/skills** (Software): Matt's open-source repository of Claude Code skills; ≈13k stars at recording time. - **Pydantic AI (Pi)** (Software): Python agent framework built from low-level primitives; cited as the high-control counterpoint to Claude Code's opaque harness. - **Obsidian** (Software): Note-taking app reportedly run by a team of four; the example for non-engineering domains where AI leverage compounds.

Alex Lupsasca — 2024 New Horizons Breakthrough Prize winner and OpenAI resident scientist — recounts how GPT-5 resolved a year-long open problem in quantum field theory: proving that single-minus gluon tree amplitudes are non-zero and finding their compact closed form. He then describes how the publicly available GPT Pro, given the gluon paper as a seed, independently generalized the result to graviton amplitudes in under three days of human clock time. Throughout the conversation, Lupsasca reflects on what this trajectory means for how physics is done, how the next generation of physicists will be trained, and where the remaining bottlenecks — verification, creativity, and publishing infrastructure — still lie. ## [00:00] Introduction to AI's impact on physics research Lupsasca opens in medias res, framing the episode's central claim before the formal introduction: AI has crossed a threshold where it can resolve questions that stumped human experts for over a year. He describes this not as a curiosity for theoretical physicists but as a profound, if underappreciated, change in the nature of scientific discovery itself. > *"That's a certain milestone that we've passed, and I think maybe for the average person on the street who doesn't care about theoretical physics, this is not very noticeable, but I think it's a very profound change and we've really passed some kind of a threshold."* ## [00:43] Guest introduction: Alex Luposka The hosts — Brandon (Atomic AI) and RJ Honicky (Miro Omix) — introduce Lupsasca as a Vanderbilt professor and OpenAI fellow who holds both the 2024 New Horizons in Physics Breakthrough Prize (often called the "Oscars for science") and the IUPAP Young Scientist Award. Lupsasca immediately sets the narrative arc: a year ago, AI was useful for email but not for his work; ChatGPT o3 was the first model that genuinely helped with research math; then GPT-5 reproduced one of his hardest published results in 30 minutes. > *"When GPT-5 came out it was able to reproduce one of my best papers that took me a very long time to come up with in like 30 minutes. And that's when I really became AI pilled."* ## [02:49] Alex joining OpenAI and the shift in physics research After GPT-5's release, Lupsasca began evangelizing the shift to colleagues who were skeptical. Finding OpenAI equally excited, and being on sabbatical, he joined as resident scientist — the person physicists around the world now email when something astonishing happens. He describes receiving an inbound that week about Codex simulating the Sachdev-Ye-Kitaev (SYK) model in 10 minutes, a feat that many research groups had struggled to achieve due to the narrow Venn diagram of physicists with strong coding skills. > *"I talked to OpenAI. They were also really excited and I thought I have to get in on this and to understand that this is happening and not be a part of it is a huge mistake so I have to go to OpenAI."* ## [04:08] The release of GPT-5 and the shift in capabilities Lupsasca contrasts the lukewarm Twitter reception of GPT-5 (complaints that it was not better at writing email) with what he observed at the science frontier. He notes GPT-5.4 is another significant jump, and describes how AI capabilities for physics have been accelerating rapidly since o3, the first reasoning model strong enough for research-grade mathematics. He uses this as a bridge to the central technical story of the episode: a pair of new papers on gluon and graviton scattering amplitudes. > *"At the science frontier the capabilities were really taking off."* ## [10:05] Explaining Quantum Field Theory and amplitude calculations Lupsasca gives an accessible primer on quantum field theory (QFT), the framework that reconciles special relativity and quantum mechanics. The key objects in QFT are scattering amplitudes — complex-valued functions that encode the quantum probability for a set of incoming particles (with given energies, momenta, and polarizations) to scatter into a set of outgoing particles. These amplitudes are computed at particle colliders like the LHC, and knowing the n-point amplitude (for any number n of particles) encodes essentially the full content of the theory. > *"If you have a particular force and you're able to compute the n-point amplitudes... you know everything about the theory."* ## [14:20] Overview of gluons and the strong force Gluons are the force-carrying particles of the strong nuclear force — the force that, despite like-charge repulsion between protons, holds the atomic nucleus together. They are the QFT analog of photons for electromagnetism and gravitons for gravity. Like photons, gluons carry a polarization (helicity): positive (right-handed) or negative (left-handed). This helicity structure is central to the paper discussed next. > *"The strong force is mediated by the exchange of the particles of the strong force, which are called gluons, because they're what glues together the nucleus of the atom."* ## [14:38] Discussing the first research paper on single-minus gluon tree amplitudes Lupsasca unpacks the paper's title — "Single-Minus Gluon Tree Amplitudes Are Non-Zero" — piece by piece. Tree amplitudes are the leading-order (no-loop) contributions to scattering. All-plus-helicity amplitudes are exactly zero by a symmetry argument. Single-minus amplitudes — where all but one gluon have positive helicity — were assumed in textbooks to also be zero by the same argument. The paper proves they are not. The result involves collaboration with Alfredo Guevara (IAS), David Skinner (Cambridge), Andrew Strominger (Harvard), and Kevin Wheel. > *"If you look at the lecture notes and textbooks that have been written on this, the same argument that rules out the all-plus amplitudes also appears to rule out the single-minus amplitudes."* ## [20:56] How ChatGPT helped solve a year-long physics puzzle Strominger, Guevara, and Skinner had understood for about a year that the textbook argument has a loophole: when particles are collinear (exactly aligned in momentum), the standard dimensional-analysis reasoning fails, and single-minus amplitudes can be non-zero. But computing what those non-zero amplitudes equal had eluded them. Lupsasca invited Strominger to visit OpenAI and work on it with AI. The week before Strominger's flight, Lupsasca began using ChatGPT Pro. By the time Strominger landed, they had the answer. > *"Using ChatGPT we solved the problem before he even got off the plane."* ## [23:02] Complexity of manual calculations in physics Lupsasca shows the audience a concrete illustration of the difficulty: the six-point single-minus amplitude, worked out by hand by Alfredo Guevara, is a sum of 32 terms each of which is itself a product of four complicated factors. The number of terms grows factorially with the number of particles n — super-exponential growth. This is the messy representation that the group had been staring at for a year, seeking the analog of the elegant Parke-Taylor formula. > *"By the time you get to six terms, it explodes in your face."* ## [26:12] The history and mechanics of Feynman diagrams Feynman diagrams are a visual language introduced by Richard Feynman to organize perturbative QFT calculations: diagrams represent possible intermediate histories of a scattering process, and the full amplitude is a sum over all of them. Diagrams are organized by number of vertices (interaction points); each additional vertex is suppressed by the coupling constant, so tree diagrams (fewest vertices) dominate. Loop diagrams — where intermediate particles are created and annihilated — contribute smaller corrections. The combinatorial explosion of tree diagrams is the root cause of factorial growth. > *"In principle, there are infinitely many pictures to sum over."* ## [27:44] The Parke-Taylor formula and the quest for simplification In the 1980s, Parke and Taylor computed the "maximally helicity violating" (MHV, or double-minus) gluon amplitudes through a heroic Feynman diagram expansion. Despite the factorial number of terms, everything canceled to leave a single compact formula — the Parke-Taylor formula — that fits in half a line. Strominger, Guevara, and Skinner spent a year looking for the analogous compact formula for the single-minus case. Their search stalled at the level of the messy Feynman representation. > *"Andy, Alfredo and David spent the last year chasing the analog of the Parke-Taylor formula, the very simple answer that was obtained in the '80s for the double minus amplitudes."* ## [31:26] Using ChatGPT to find the simplification in the special phase space region When the five-point single-minus amplitude was fed to ChatGPT Pro, the model identified a special subregion of phase space (where one particle's frequency has opposite sign) in which the amplitude simplifies from eight terms to a product of just three. This appears not to have been a known fact; the model wrote Python code and tested thousands of possibilities to deduce it. Moving to the six-point amplitude (Guevara's hand calculation), ChatGPT simplified 32 terms to a product of 4. It then conjectured the general n-point formula — with only linear growth in the number of terms, the best possible behavior. GPT-5.2 Pro guessed the formula but could not prove it. > *"The formula that it proposed, instead of having this factorial growth... here it's actually linear. So if you double the number of particles, you only double the number of terms."* ## [38:07] Proving the formula from scratch to ensure validity To obtain a proof, Lupsasca used an internal OpenAI model with extended reasoning. He gave it the problem cold — without the conjectured formula — and asked it to find the general answer in the special phase-space region. After 12 hours of computation, the model independently rediscovered the same formula and produced a complete three-step proof. The proof constitutes the bulk of the published paper. The team kept the AI attribution to one paragraph, framing the paper as a physics result that stands on its own merits. > *"We gave it the whole problem from scratch... and it came back with the same formula which we had not given it. So it rediscovered the correct formula. But this time it also found the proof."* ## [41:00] Determining the scientific impact and future research Asked to compare the result to the Parke-Taylor formula, Lupsasca is candid that scientific impact is only assessable decades later, but argues the result is genuinely surprising and should open a line of attack toward deeper questions in quantum gravity. The conversation pivots naturally to the second paper. > *"I think the true value of a paper can only be assessed decades into the future based on how much future work it leads to and what developments it opens up."* ## [42:27] Introduction to the second paper on graviton amplitudes Gravitons are the hypothetical quanta of gravity — the spin-2 force carrier analogous to the spin-1 photon (electromagnetism) and gluon (strong force). Unlike gluons, gravitons have never been directly detected, but they are central to quantum gravity theory. The second paper, "Single-Minus Graviton Tree Amplitudes Are Non-Zero," shows the same loophole applies to gravity and that a compact formula extends there too — despite gravitons being mathematically more complex than gluons. > *"We wrote this paper which is called single minus graviton tree amplitudes are non-zero. So it's the same title almost, except with graviton instead of gluon."* ## [45:41] Defining particles, irreducible representations, and symmetry Lupsasca sketches the modern QFT definition of a particle (an irreducible representation of the Poincaré group, classified by Wigner according to mass, spin, and charge) and explains why gravitons are spin-2 while gluons and photons are spin-1, making graviton polarization data twice as rich. Crucially, the second paper was complete within three days of the first going public — most elapsed time was spent verifying correctness, not computing. > *"Most of the time was spent verifying the answer, not writing, which is insane, actually, if you take a step back."* ## [47:46] How GPT Pro generalized the research to gravity For the graviton paper, no internal model was needed — the publicly available ChatGPT GPT-5.2 Pro sufficed. Lupsasca provided the gluon paper as context plus two paragraphs describing the key mathematical changes, then said "Good luck. You're a brilliant theoretical physicist." Over a 110-page exchange, the model worked through the graviton calculation — applying the directed matrix tree theorem, a piece of known combinatorics that neither Lupsasca nor collaborators had thought to invoke — produced correct intermediate results, and wrote a draft paper very close to the final arXiv version from section 3 onward. > *"It's a real solid result in quantum gravity that was done pretty much completely by an AI with human steering it and asking kind of the right questions."* ## [53:57] The epistemological shift: Is this a new way of doing physics? The hosts raise the central epistemological question: if an undergraduate with domain knowledge and good prompting could have done this, what does graduate training mean now? Lupsasca agrees this is the hardest open question facing academia. He notes that arduous calculation trains not just skill but self-confidence, that the gap between coursework and the research frontier is growing, and that many "easy" problems professors once assigned to students are now solvable by AI in minutes. He offers two concrete ways AI has already changed his own workflow: dramatically reducing time spent confused between steps, and enabling parallel AI scouts that explore multiple research directions simultaneously. > *"With AI, actually, you can launch 10 instances of chat and have each one try a different route and send it as a scout that moves very fast into the unknown."* ## [59:27] The use of AI as a 'scout' for research directions Lupsasca elaborates on the scout metaphor: rather than carefully mapping a route from A to C before committing to it, a researcher can now dispatch many AI "scouts" in parallel, get rapid feedback on which directions are promising, and redirect human attention accordingly. Even when a scout makes errors, its signposts reduce orientation cost for the human following. This constitutes a qualitatively new mode of research — one where the bottleneck shifts from calculation to judgment about which directions matter. > *"Even if ChatGPT doesn't always get everything right, just kind of having a scout that signposts some key steps along the way that you can use to anchor your own movement is extremely helpful."* ## [61:44] The role of 'taste' and collaboration with AI The hosts push on the problem of "taste" — the ability to identify which questions are at the productive edge of knowledge. Lupsasca argues that working effectively with ChatGPT requires the same skill a professor develops advising students: knowing what question to give, at what level of detail. "Taste" — knowing where the frontier is and which questions there are tractable — is the last skill to develop and the one AI currently lacks. AI is, he says, like an extremely technically skilled graduate student: given a sharp, well-posed question, it can do incredibly hard computations correctly, but it does not yet know which question to ask. > *"The difference between a good physicist and a great physicist is knowing what is the right question to ask — that is actually the hardest part of being a scientist."* ## [70:23] Personal evolution from AI skeptic to resident scientist Lupsasca recapitulates his personal arc: skeptic → converted by o3 (which solved in 11 minutes a calculation that would have taken him days) → "AI-pilled" by GPT-5 (which reproduced, in 30 minutes, his best published result on black hole Love numbers and tidal symmetries — a paper whose training cutoff predated its arXiv release) → now resident scientist at OpenAI. He notes that no competing model at the time could match GPT Pro on that calculation. > *"In under 30 minutes, with one hint... it completely solved this problem, which is one of the nicest calculations that I've ever done."* ## [72:46] Solving a black hole perturbation problem with GPT-5 Lupsasca details the "Move 37" moment that converted him: his paper "Why Is There No Love in Black Holes?" establishes new symmetry generators for perturbations of a Kerr black hole (explaining why black hole Love numbers — tidal response coefficients, named after mathematician Augustus Love — are exactly zero). When GPT-5 Pro was first given the full problem cold, it failed. But after being primed with the simpler flat-space warm-up (a 200-year-old known result), it then solved the full Kerr black hole problem in 18 minutes. > *"GPT-5 was able to reproduce one of my hardest calculations, which I think the number of people in the world that could do that you could count on your hands."* ## [76:34] Discussing whether AI can make original, conceptual leaps The hosts ask whether AI is doing genuine recombination versus true creative leaps. Lupsasca cites Terry Tao, who has not yet seen an AI proof that cannot be traced to an obscure reference. But Lupsasca has been impressed and frames the distinction as one of degree rather than kind — humans may also be recombination machines. He believes continued scaling will produce feats of insight that look like creativity, and notes OpenAI is actively working on enabling models to take bigger, more out-of-distribution leaps suited to scientific discovery. > *"I'm not sure there's a qualitative difference. I think it's just a matter of degree — as we continue scaling the capabilities, I don't see why it's going to stop."* ## [80:09] Challenges of 'AI slop' and the future of academic publishing With models now capable of turning out a physics paper in 30 minutes when properly steered, the arXiv preprint server is being flooded with submissions. Lupsasca distinguishes legitimate use (expert steering + careful verification) from "AI slop" — poorly prompted outputs submitted without adequate checking. His proposed response: raise the bar rather than increase volume. The single-minus amplitude papers open a clear line of attack toward genuine quantum gravity questions; the goal should be to pursue harder problems, not to publish incrementally. > *"Instead, I think now that we have this new tool that gives us AI superpowers, I think we should just raise the bar for what it means to write a good paper."* ## [83:13] The bottleneck of writing academic papers Asked what single bottleneck he would remove, Lupsasca nominates the paper-writing process itself — finding it increasingly strange that researchers use AI to do calculations, compress results into a static paper, and then readers feed that paper back into AI to understand it. He envisions interactive, LLM-embedded papers as a plausible future. He also identifies two missing capabilities in current models: (1) the spark of creativity to identify the next important question, and (2) reliable self-verification, so that the onus of checking long AI-generated proofs does not fall entirely on humans. > *"Maybe some kind of interactive paper which lives in some LLM. Maybe your whole paper is some ChatGPT page... I think we're going to head in that direction."* ## [90:19] Final takeaways and looking ahead to the next year Lupsasca's closing message: pay attention. The trajectory from "useful for email" to "solves open problems in quantum gravity" has taken roughly 18 months. Models are solving open problems that expert communities spent years on. Extrapolating forward, with more scaling already in the pipeline, the next 6 to 12 months should bring further surprises. The right posture is excitement, careful verification, and a commitment to pursuing harder problems. > *"If you just extrapolate that into the future, imagine where we're going to be in 6 months or a year — I think it's kind of surreal to live through this time, but it's really happening."* ## Entities - **Alex Lupsasca** (Person): Theoretical physicist, Vanderbilt University professor and OpenAI resident scientist; 2024 New Horizons Breakthrough Prize and IUPAP Young Scientist Award winner; expert in black hole physics and scattering amplitudes. - **Andrew Strominger** (Person): Harvard professor and Lupsasca's former PhD advisor; pioneer of celestial holography; co-author of both single-minus amplitude papers. - **Alfredo Guevara** (Person): Postdoctoral researcher at the Institute for Advanced Study (IAS); performed the foundational hand calculations underpinning the AI-assisted breakthrough. - **David Skinner** (Person): Professor at Cambridge University; co-author of the single-minus gluon amplitude paper. - **Terry Tao** (Person): Fields Medal-winning mathematician at UCLA; referenced regarding the question of whether AI proofs involve genuine creativity. - **Scattering Amplitudes** (Concept): Complex-valued functions in quantum field theory encoding probabilities for particles to scatter; the central mathematical objects of both papers discussed. - **Single-Minus Gluon/Graviton Amplitudes** (Concept): Tree-level scattering amplitudes where all but one particle have positive helicity; previously assumed zero in textbooks but shown non-zero in a collinear phase-space region. - **Parke-Taylor Formula** (Concept): Compact closed-form result for maximally helicity violating (MHV, double-minus) gluon amplitudes derived in the 1980s; the template whose analog was sought for single-minus amplitudes. - **Feynman Diagrams** (Concept): Diagrammatic technique to organize perturbative QFT calculations; individual diagrams represent distinct intermediate-particle histories whose amplitudes are summed. - **Love Numbers** (Concept): Coefficients encoding tidal deformability; famously vanish for black holes, a fact connected to hidden symmetries studied in Lupsasca's "Why Is There No Love in Black Holes?" paper. - **Celestial Holography** (Concept): Research program exploring symmetries of quantum gravity via scattering amplitude structure; motivates studying graviton amplitudes. - **OpenAI** (Organization): AI research company where Lupsasca serves as resident scientist; developer of GPT-5 and the internal extended-reasoning model used for the amplitude proof. - **arXiv** (Organization): Open-access physics and mathematics preprint server; mentioned in the context of AI-generated "slop" flooding submissions. - **GPT-5 / ChatGPT Pro** (Software): OpenAI's frontier language model used as the primary AI tool in both amplitude papers; capable of extended reasoning steps of 20-34 minutes per prompt.