
Building at Anthropic Labs @anthropicai. Before: CPO at Anthropic, co-founder & CTO of @instagram and @artifact_news
37.760571,-122.387567
Joined November 2006
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Very fun to see the team both ship new native artifact types like sheets and whiteboards today, and also open up the platform for developers to build full experiences into Claude as well.
Replying to @claudeai
Also new: with interactive connectors, you can now open the full version of a tool inside Claude. Work in Adobe, Atlassian, and Box beside your conversation. Make changes yourself, or ask Claude to make them with you.
Rolling out on web and desktop.
Claude Fable 5.2 and Mythos 5.2 are out today!
They’re super sharp to work with. On complex problems you can really feel the extra intelligence; researchers working with Fable 5.2 solved two problems from theoretical physics.
Fable is also a great thought partner on strategy, paired with Opus 5.5 for a lot of my work.
Can't wait to see how you use Fable 5.2 to bring your big ideas to life!
We're opening Claude Duet today as a research preview, starting with a waitlist. It's our take on giving everyone a trusted partner with your work.
I've been using it for a few weeks, at work and at home. It drafted questions for a fireside chat, watched Slack over the weekend so I could log off, and told me about the new @nealstephenson book — and then ordered it from my local bookstore once I asked.
We've found Opus 5.5 was our first model with the judgment to be proactive in the right ways. Here's what that's looked like.
You can join the waitlist here if interested: claude.com/product/claude-du…
and learn more here: claude.com/resources/article…
Another model joins the 5.5 family with the small but mighty Haiku 5.5! It’s built for speed and efficiency, and costs 75% less than Haiku 4.5. Opus does the heavy thinking, Haiku does the high-volume work, and together you get more done for less. Happy shipping!
Sonnet 5.5, the second release in the 5.5 family, is out! It’s 30%+ faster than Sonnet 5 and up to 30% cheaper for most work.
Go try out Opus 5.5, which we launched today! It leads in coding and knowledge work, and it’s a great writer. It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5.
Omid and the team did great work on this one. Most of my Claude Desktop work these days is in these new-style projects and I've really enjoyed how easy it is to kick off a bunch of work while still having a coordinator Claude responding quickly
Super excited to show the world Projects!!
We've been building this for the last few months and it has become my new daily driver. A few tips for getting the most out of it 🧵
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I had trouble picturing the whole Iron Tangle level from Dungeon Crawler Carl, so I made an interactive artifact and I think I finally understand it: claude.ai/artifact/NTcG664cC…
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Also new today: Claude Docs, Claude Slides and Claude Design are now available in every conversation, powered by a revamped Artifacts platform.
Ask for a design, deck, or document. Get back something you can edit, download, and take anywhere.
Try it out for yourself and let us know what you think.
Claude Cowork and Chat are now one Claude, starting today.
The most common thing we hear: people aren't sure which product to start with. That friction gets in the way of getting the best from what these models can do.
I've been on the unified version for a few weeks and really enjoy it. Claude does the deciding about how to get there, while I get to keep my thinking on the work itself.
Let us know what you think! We'll be getting it dialed in over the coming weeks.
We launched Claude Fable 5.1 this morning! Fable models are built for complex, multi-step work that runs on its own, and Fable 5.1 sets a new standard across coding, knowledge work, and long-running problem-solving tasks.
Opus 5 quickly became my daily driver both at work and on the weekends. It can work for hours on complex tasks, and I've found it consistently gets to the bottom of tricky tasks. I also had some fun building some games with it 🧵
In this game, the "era" of a game is adjustable in real time, which you need to do to solve puzzles — for example, a bridge that's solid in the 1980's becomes hollow when you fast forward through time:
youtube.com/watch?v=zfhBeZHz…
New today as Claude Cowork starts rolling out to web and mobile: Chat and Cowork now share one home tab on web and desktop — one sidebar, one search, and one place for your Projects & Artifacts. Keep an eye out for even better Chat + Cowork integration soon, too.
One of my favorite things we've shipped recently — used it today to visualize a tricky set of experiment gates & logic, and communicate that to the team.
Our Labs team worked on this along with the Claude Code team — as Claude's work gets deeper and more independent, I've found really valuable to have it explain its thinking and outputs using Artifacts; try asking it to diagram its work next time you're working with it.
Claude Fable 5 is out today. The first Mythos-class model everyone can use & the first model I hand off whole projects to. This weekend I built a self-maintaining, proactive media tracker for myself, over 2 days with Fable taking large chunks at a time
Been building with Claude Opus 4.8 (out today!) for a couple weeks and it's already the model I reach for first. The best part is how much I can just let it run. It's more honest about its own work, flags what it's unsure of, & catches flaws in its code before handing it back.
Excited for this one — everything you need to ship production agents at scale, without having to spend months on infra work.
Always great to chat with @danshipper ! Love what he and the team at @every are cooking up, we could have talked for hours.
The rules of professional product development are being rewritten in real time.
- PMs and designers can ship software as easily as engineers.
- Software is no longer just built for humans—it’s also built for agents as first-class citizens.
To better understand how we build products in this world, I invited Mike Krieger (@mikeyk) on @every’s AI & I podcast. Mike cofounded Instagram and is now a member of the technical staff at Anthropic, co-leading Anthropic Labs, their internal incubator for experimental products. He's been at the frontier of two transformative technology waves: mobile/social and now agent-native software.
We discussed:
- How to build a truly agent-native product. The best products today, like Claude Code, allow users to do things that their creators never intended. But that requires hard trade-offs between freedom and safety/reliability for frontier products, an issue that Mike's team is learning how to solve.
- What's different about building now versus building Instagram. At Instagram, it took months to hit dead ends and learn what to cut. Now, that cycle runs in hours.
- The trap of building too much, too fast with agents. You can go from idea to a nearly-shipped product in a day, but that process doesn’t give you the incremental feedback that used to tell you what not to build. The models are great at adding features, but can create a product that lacks coherence.
- How Anthropic Labs structures product teams. New product experiments are led by only two people, usually a product manager or designer paired with an engineer. Mike says bigger teams tend to be too slow because of coordination costs.
- Why you need to throw out your product and start over every three to six months. AI progress means most of your harness will be outdated quickly—the best teams build this into their product strategy.
And much more! You should watch this one.
Timestamps
Introduction:
What's gotten easier—and what hasn't—about building products in the age of AI:
Why vibe coding creates "indoor trees":
How rewrites have become a normal part of the development process:
What "agent native" product design means:
How Mike's labs team is structured and the cofounder model:
The best signal for a product bet is someone with "break through walls" conviction:
Navigating enterprise customers while keeping pace with rapid AI change:
OpenClaw, personal agents, and the product question defining 2026:





