Your site can now hand ChatGPT and Codex its own WebMCP tools
The built-in browser now runs tools a page defines for GPT-5.6; Codex control reaches Edge, Brave, Opera and Vivaldi, plus cloud sign-in and a deprecation.
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Site tools, and what to build this weekend
Register WebMCP tools in your page's JavaScript — a doc editor might expose 'find this section' or 'post a comment' — and ChatGPT or Codex discover and run them on the same live, signed-in page while you watch. It makes your app agent-operable without shipping a separate API. GPT-5.6 Sol or Terra only; Luna has it off.
Codex breaks out of Chrome
The ChatGPT browser extension now drives Edge, Brave, Opera, and Vivaldi as well as Chrome, with tab mentions and full browser control across all five (Opera skips side chat). Your browser automation no longer has to live in Chrome.
Cloud sign-in that won't touch your logins
On eligible plans you can sign into a supported site through the cloud browser on web, iOS, and Android, kept isolated from your local session — so an agent run doesn't ride on your day-to-day cookies. Not in Enterprise or Edu yet.
codex mcp-server is deprecated
If you wired Codex into an MCP client: as of Aug 24 the `codex mcp-server` command is deprecated — migrate to the Codex app server. CLI 0.149.1 shipped alongside with minor fixes.