Some news: I’m joining OpenAI to lead product management for Core Products!
I have a lot of respect for OpenAI for showing the world that scaling works, for bringing AI to over a billion people, and for believing great products are core to the mission.
I’m excited to work with @thsottiaux, an incredible PM team, and everyone across OpenAI. Together, we’ll build agents that have your back and your team’s, and keep you in control, so you get more time for the people and work you love.
Lots to learn, and lots to build. Please keep your feedback coming!
Friday was my last day at Anthropic.
Two years ago, when Claude Code was a small internal tool, I asked it to build an RL env. I steered it for tens of hours but never manually wrote a line of code. It worked, I was hooked, and I joined the team.
When we first launched, most people approved every permission prompt by hand and mostly used Claude to answer questions and write tests.
Today, the default is trusting Claude's judgment to auto-approve. Claude does large migrations and builds new products.
Helping build Claude Code into an industry-defining product has been the journey of a lifetime.
Thank you to the incredible team behind Claude Code, Cowork, and Tag. These products are the sum of thousands of great ideas from you. I'll miss working with you all.
Thank you to our users for embracing a new way of working. Your constant feedback shaped so much of what we shipped and your stories made the work so meaningful.
Excited to see what you all make next!
We heard your feedback that you want Claude to proactively take more off your plate! Claude Duet is a large step in this direction - it'll notice work that needs to be done, and then do it before you ask.
Join the waitlist here: claude.com/product/claude-du…
Sonnet 5.5 is here! In Claude Code, users get ~30% more tasks done compared to Sonnet 5. It's smarter, so it needs fewer tokens for the same work.
Here it rakes a yard of leaves using tool calls. 24s faster than Sonnet 5, with 6K fewer tokens. It leaves her extra time to read :)
If you’re looking for ways to try Opus 5.5 and Claude Tag in Slack…
I used Opus 5.5 to formally verify the Claude Agent SDK using Lean. A couple short prompts = 16 PRs fixing various bugs and race conditions. Video attached.
TLA+ also works well. I sometimes combine Lean and TLA+ to look for issues around data flow, concurrency, and state mgmt.
I don't know either language well, but Claude is excellent at both. This approach is super useful for formally modeling your code and finding bugs that a human probably wouldn't have spotted.
Is formal verification the future of coding (or at least, bug finding)?
Claude Opus 5.5 is now the default model in Claude Code and the Claude app, including Cowork, for Pro, Max, and Team plans. I’ve been using Opus 5.5 as a daily driver and love its clear communication skills and ability to write in my style.
We’re defaulting to effort medium across products, which is comparable to Fable 5.1 on intelligence but faster. Your rate limits will go 25% further on Opus 5.5 compared to Opus 5.
Give Opus 5.5 an ambitious task and let us know what you think!
In the new Projects experience, Claude coordinates all of your sessions.
I've been using it every day since it lets me operate at a higher level of abstraction. I fire off a batch of tasks and move on. Claude has context on everything I'm working on and can give me an aggregated status update whenever I ask. It also has long-lived memory that evolves as I use it.
We're rolling this out over the coming weeks. Let me know what you think!
Today, we are merging Claude Cowork and chat to simplify how you use Claude!
We are also integrating Claude Design so that you can ask Claude to make a Slide, Design, or Doc without needing to switch tabs or apps.
Many of you shared that you didn't want to choose which Claude product to use for any task. As Claude models have become more capable, we've found that Claude can handle the routing for you. Based on your prompt, Claude will decide whether to give a quick answer or do deeper agentic work, and what kind of output best fits the task.
You're in control the whole time: you can still stop, redirect, or exert finer control over Claude's effort or approach.
Give it a try and let us know what you think. We're rolling this out slowly over the next few weeks to get it right.
With Fable 5.1, our team has taken on more ambitious projects that would have previously taken months. What big bets do you want to take?
Ask Fable 5.1 in Claude Code, Claude Cowork, Claude Tag to take on the task and let us know what you think!
Thanks to your feedback, we’ve unified memory across Chat and Cowork. Now, you can tell Claude to remember something once and it’ll have that context across surfaces!
Tell us what you’d like to see next :)
We'd love to talk with Cowork users in Corporate Finance and Accounting roles!
Have ideas on how we can improve? Sign up for a screen share with our team here: tinyurl.com/y5t2pepb
Join office hours with the Cowork team
If you're in marketing, sales, finance, legal, ops, or any non-eng role, book a 15 min slot to show us how you use Cowork so we can make it better for you: calendar.app.google/Nk75JSB5…
Thank you for sharing your feedback!
I love using Claude Cowork to manage my calendar. Here's my prompt for it:
Manage my calendar for the week. Requirements: 1. <20 hours of meetings 2. Dedupe conflicting meetings. Look at past weeks to see what kinds of meetings I decline. Dinners don't count against the 20 hours. Build a skill that you refine. Ask me before updating invites.
What do you use Cowork for?
You know your workflows best. Show our team how you use Cowork so we can make it work better for you!
If you're in marketing, sales, finance, legal, or any non-engineering role, sign up here for a 30 min screen share with our team: forms.gle/WVvcfdmwhRnp9DYG8
Claude Code can now open any website inside the desktop app.
Claude can use your production app, open the links it sends you, check Twitter, and even watch the FIFA World Cup!
Tomorrow at 10am PT I'm hosting a live walkthrough of how we progressed from single-player Claude Code to multi-player Claude Tag. Then, we're going deep on how Claude Tag actually works.
AI used to finish your sentence. Then, it wrote entire features. Now, Claude Tag can monitor your channels, do proactive work for you, the whole team can steer it, and it remembers what you told it last week.
Register: anthropic.com/webinars/how-a…
