After two days with Claude Fable 5 the best way I can describe it is "relentlessly proactive" - here's an example where I dropped in a screenshot of a bug and it span up custom CORS Python servers and used pyobjc-framework-Quartz to capture screenshots …↗

Getting the most out of Claude Fable 5, Anthropic’s powerful new model, you need to maximize your ambition: It’s built for full task delegation—you leave it looping for hours or overnight and come back to a finished product. If you want to get the most out of it, you need to rel…↗

the future of all work is this. You must define: - a goal - the criteria that define it - the verifier that makes sure it is achieved - the sensors that inform the verifier - the actuators that affect the sensors - The envelope that contains the sensors and actuators↗

Today I'm publishing a new essay, Policy on the AI Exponential. AI is progressing extremely fast—much faster than the policy process was built to handle. The essay lays out where I think the technology is now, and the action needed to close the gap: …↗

Every great craftsman I've ever known, from design to furniture to food, knows that the process and tools with which you make the work is as important as the work itself. I share more about how I think and apply this to software design at interfacecraft.dev↗

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Wrote up my initial impressions of Claude Fable 5 - it has a big model smell: slow, expensive and capable of crunching through pretty much everything I threw at it simonwillison.net/2026/Jun/9/cla…↗

Mythos 5 wrote this melody which I absolutely love Oh, and it also wrote this piano visualizer (naturally)↗

I've had access to Fable for a bit. A genuine jump in capability, I could feed it a 15 page design document for a project and it would work for 9+ hours and deliver terrific results. But working with it is weird & weirder is coming Lots of examples: …↗

BREAKING: Anthropic just dropped Claude Fable 5—this is Mythos, made safe for public release. It is the best coding model in the world. We've been testing it internally @every for the last week or so across coding, writing, marketing, editing, and more—here's our vibe check: -…↗

A lot of designers were asking for the storyboard behind this animation, so I decided to share it with the client's permission. All the rejected hooks/options and many concepts are still there Enjoy!! figma.com/design/yxixVaj…↗

Design is full of codewords. Knowing them changes what you can ask for, and what you can get back, whether you're working with devs, or an AI. “tint this neutral color”, “fix this widow”, “nudge it to the optical center” I wrote them down: index.how/to/articulate↗

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New Science Blog: Why has AI advanced faster in coding than in biology? To agents, bio databases are like cities built before cars—maddening to drive in because they're designed for different traffic. How do we build infrastructure agents can use? …↗

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Welcome to the Token Casino It’s not a secret that the Labs make more money when you spend tokens. But your company wins when you ship more product and get paying customers. A casino analogy isn’t perfect. Casinos are built around negative-sum games; AI agents can create real v…↗

Here is our current plan for OpenAI: openai.com/index/built-to…↗

New Anthropic Science Blog: Making Claude a chemist. To manipulate a molecule, chemists first need to understand its structure. Their main tool is NMR spectroscopy. We found Opus 4.7 matches—and on some tasks beats—dedicated NMR software. Read more: …↗

Every Company’s First AI Strategy Should Be a Skill Library Watch your best people work long enough and you notice something. They have patterns. A great salesperson approaches an important call with a clear sense of what matters. They look for the last conversation, identify t…↗

MAFIA EP 001↗

Our internal data shows Claude is accelerating AI development—a possible path to recursive self-improvement, or AI autonomously building a more capable successor. It’s happening faster than we thought, and the implications deserve greater attention. anthropic.com/institute/recu…↗

We’ve been researching new ways for ChatGPT memory to carry context across conversations and keep it useful over time. Today, that work is rolling out as a more capable memory system in ChatGPT. openai.com/index/chatgpt-…↗

been enjoying breaking down Cloud concepts into small visual moments I think Infrastructure feels a lot less abstract when you can see it↗

Welp, that happened faster than I predicted. Thought it would be end of 2027, then early 2027, but agentic traffic growing so fast that bots have now passed human traffic online for the first time in the Internet's history. radar.cloudflare.com/traffic#bot-vs…↗

How do we automate business analytics with Claude? New blog post covering our best practices for skills, data foundations, and evaluations when building agents to perform data analysis: claude.com/blog/how-anthr…↗

Here’s the video of my talk at MS Build: Build the thing that builds the thing. build.microsoft.com/en-US/sessions…↗

I’ve been dumping on OpenAI with low effort meme tweets that get too many views, but Codex is the best DevX acceleration product of all time and I wrote about it here: cpojer.net/posts/modern-e…↗

New Post: Wrote about my latest LLM Workflow & Modern Engineering Values: cpojer.net/posts/modern-e…↗

A great cloud agent experience involves a lot more than moving a local agent to a server. We've learned that it requires a durable execution platform, a powerful harness, and the tools and infra to give agents realistic development environments. cursor.com/blog/cloud-age…↗