🧠 Claude 5.5 Models, GPT-6.1 Sol, and an Activity Feed for Your Agents
If your agents use a Stable Claude model, they moved to the newest Claude models over the past few weeks without you changing a setting. And you can now open a real conversation and see what the agent did.
🧠 New models, already running
Claude 5.5 is the new Stable. Claude Opus 5.5, Sonnet 5.5 and Haiku 5.5 now back the Claude Stable rows in the model picker. Agents on a Stable Claude row are already on 5.5. Agents pinned to a specific version stay where you put them. How Stable and pinned versions work.

GPT-6.1 Sol. On Claude Agent SDK agents, the GPT Sol Stable row now runs GPT-6.1 Sol.
Gemini 3.8 Flash. Claude Agent SDK agents offer Gemini 3.8 Flash in place of 3.7 Flash. Agents that were on 3.7 Flash were moved to 3.8 Flash for you.
Claude Fable 5.1. Now in the model picker for agents that run on your own Anthropic API key.
Try a model before you switch. In Improve & Try, pick a different model for a single turn. The agent's saved model, and every channel it serves, stays the same.
Check yours: open an agent, go to Settings, and look at Model Selection.
🔍 See your agents' conversations in Activity
Each agent has a new Insights → Activity tab: a feed of real conversations across your channels. Open one to see the trace behind the reply, step by step, including tool calls. Learn more.
⚡ Also shipped
A faster editor. Instructions is now an outline with an inline editor and Cmd/Ctrl+S. Tools is a list. Open a tool to switch individual actions on or off. Instructions, Tools.

Easier to find your way around. The Integrations page groups what you have connected into Channels, Knowledge and Tools, with a catalog you can browse by category. Settings is grouped into Account, Organization, Security and Billing.
More Slack options on the Claude Agent SDK runtime. Reply without @mention, and Trigger by keyword for top-level posts. Runtimes.
Another Slack workspace. Add a second workspace from the Slack integrations page, with the shared @Runbear bot or your own custom bot.
Your own Slack welcome. Custom Slack bots can set the greeting and options in Slack's assistant panel, in any language.
Clearer knowledge sync. Google Drive and SharePoint files we can't index now show as skipped, with the reason, and .md, .json and code files inside a selected Drive or SharePoint folder now sync. Disconnecting a source erases its indexed content.
Take over a knowledge source. If you don't own a Notion, SharePoint or Google Drive source, connect your own account to take it over. What is already synced stays.
Spreadsheets you can find by name. CSV and Excel files synced from now on also match a search for their filename, not just their contents.
A disconnected tool no longer ends the reply. If a tool needs someone to sign in, the agent still delivers its answer.
Connectors. A native Algolia connector, an API key option for Linear, and full action lists for 13 more connectors so you can switch off individual actions. Agents deployed to Zendesk now see the files attached to a new ticket.
Smaller touches. Browser tabs are titled after the page you are on, and knowledge source sheets save when you click Done and discard on Cancel.








