ChatGPT browser extension expands to Edge, Brave, Opera and Vivaldi and adds WebMCP site tools

On August 25, 2026, OpenAI's desktop release 26.820 brought the ChatGPT browser extension to Microsoft Edge, Brave, Opera and Vivaldi, and let ChatGPT Work and Codex use WebMCP site tools in the desktop app's built-in browser.

Archive entry: this covers an event from August 25, 2026, and we published it on November 8, 2026. The details come from sources dated at the time and may have changed since.

On August 25, 2026, OpenAI's desktop release 26.820 brought the ChatGPT browser extension to Microsoft Edge, Brave, Opera and Vivaldi in addition to Chrome, as the ChatGPT and Codex changelog records. The release also let ChatGPT Work and Codex use tools that websites expose through WebMCP, and added cloud browser sign-in for ChatGPT Work.

What the release changed

Browser setup happened in the Computer Use section of Settings in the ChatGPT desktop app.
All five browsers, Chrome, Microsoft Edge, Brave, Opera and Vivaldi, supported tab mentions and browser control, while Opera did not support side chat.
With site tools (WebMCP), ChatGPT Work and Codex could use tools provided by a website in the desktop app's built-in browser.
Site tools required GPT-5.6 Sol or GPT-5.6 Terra and an up-to-date desktop app.
Site tools were not available with GPT-5.6 Luna or in Enterprise or Edu workspaces.
On eligible plans, ChatGPT Work on the web, iOS and Android could ask users to sign in to a supported website through the cloud browser.

What it meant for people building with agents

WebMCP gives sites a way to hand agents structured tools instead of forcing them to scrape the screen, and this release brought that approach to ChatGPT Work and Codex inside the desktop app's built-in browser. For people building agents, the main constraints were the model and plan requirements, since site tools were limited to GPT-5.6 Sol and GPT-5.6 Terra and excluded Enterprise and Edu workspaces.

Sources

ChatGPT & Codex changelog: Browser extensions, site tools, and cloud sign-in 26.820 (OpenAI, August 25, 2026, official)

Written with AI assistance, strictly from the sources listed above. Before it went live, automated checks verified its dates, sources and every language edition.