Claude Cowork Is No Longer a Separate Tab: Anthropic Merges It Into Chat, Launches Docs and Slides

Anthropic's own headline is "Cowork and chat are now one Claude" — not a shutdown, just no more manual tab switching.

Marcus Ide · September 18, 2026

Anthropic announced on September 16, 2026, that Claude Cowork and Claude's regular chat interface are officially merging into one — users no longer need to decide, before starting a task, whether it belongs in Chat or in Cowork. Claude now judges on its own whether a request needs a quick answer or multi-step work spanning files and tools. In the same announcement, Anthropic launched two new beta products, Claude Docs and Claude Slides, and folded the previously standalone Claude Design...

advanced

After Your Account Moves to the New Claude Experience, Where Did Cowork's Global Instructions and Storage Folder Go?

Anthropic's specific reminder: check that your instructions are what you...

advanced

Five Things You Still Can't Do After Cowork Merges Into Chat — Especially the Incognito One

Incognito chats still work, but they open in "the previous experience" — not...

news

Cowork Can Now Operate Your Computer in the Background — But Anthropic Itself Says the Guardrails "Aren't Absolute"

Straight from Anthropic: these guardrails are trained in, but they aren't...

Useful Resources

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Glossary

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Golden Set

A fixed set of real tasks whose correct outputs have already been approved by a human, re-run after every prompt edit or model change so the difference between the old and new output shows whether the change actually helped instead of just feeling better.

A golden set is a small, fixed collection of real tasks — usually twenty to fifty — where someone has already reviewed the output and confirmed it...

intermediate

Anomaly Detection

Asking Claude to comb through a batch of data and flag whatever clearly deviates from the normal range, attaching a possible direction for the cause — this is the act of finding what looks off, and nothing more. It doesn't include judging whether that oddity is actually an error; that judgment gets handed to someone actually capable of making it.

<a href="/en/glossary/core-concepts/anomaly-detection/">Anomaly Detection</a> refers to asking Claude to find items within a batch of data that...

beginner

Chain of Thought

Ask Claude to write out the intermediate reasoning steps within a single reply, instead of jumping straight to the conclusion — you don't just see the answer, you see how it was derived, which means you can also see exactly which step went wrong.

<a href="/en/glossary/core-concepts/chain-of-thought/">Chain of Thought</a> means asking Claude to write out its reasoning step by step within a...

beginner

Weekly Picks

advanced

What Does the Effort Control in Cowork Actually Adjust? It's Not the Same Thing as Switching Models

At lower effort, Claude tends to just ask you rather than spend compute guessing — that's not a...

Cora Mitchell

news

Claude in Chrome's Side Panel Now Runs Full Cowork Sessions: Start a Task in Your Browser, Finish It on Your Phone

Claude in Chrome's side panel now runs a full Cowork session — a task started in the browser can...

Marcus Ide

workflows

Before You Chain Excel and PowerPoint in Claude Cowork, Understand How Data Actually Flows Between Them on Its Own

Claude might move a chart from Excel into a presentation without you ever explicitly asking for...

Cora Mitchell

beginners

When Should You Use Claude Cowork Instead of Just Chatting? Anthropic's Five-Point Checklist

If what you want fits in a few sentences, use Chat. If what you need is a deliverable, use...

Jake Sorensen