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OpenAI Launches Codex Chrome Extension, Hits 4 Million Users

5/8/2026

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Summary

Story summary

OpenAI launched Codex for Chrome, a browser extension that runs on Macs and PCs.
The extension installs via the Codex Plugins menu, runs on Windows and Mac, and lets Codex test web apps and gather context across tabs.
OpenAI reports Codex now has over 4 million weekly active users, an eight-fold rise since the start of the year.
OpenAI plans to later combine Codex with ChatGPT and its Atlas browser.

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Story summary

OpenAI launched Codex for Chrome, a browser extension that runs on Macs and PCs.
The extension installs via the Codex Plugins menu, runs on Windows and Mac, and lets Codex test web apps and gather context across tabs.
OpenAI reports Codex now has over 4 million weekly active users, an eight-fold rise since the start of the year.
OpenAI plans to later combine Codex with ChatGPT and its Atlas browser.