OpenAI just put Codex inside Chrome. The extension runs on macOS and Windows, driving the same tabs, cookies, and signed-in accounts you already have open — no sandbox, no screen takeover.
4 million weekly active users, up 8x since January 2026. Codex went from neat IDE thing to OpenAI’s fastest-growing product in five months.
What it actually does
Codex can navigate tabs, fill forms, debug front-end flows in DevTools, and pull context across multiple tabs. Because it rides your logged-in session, it acts on LinkedIn, Salesforce, Gmail, and internal tools — the stuff Claude’s Computer Use still handles awkwardly.
You can spin up multiple agents bound to different tabs, grouped via Chrome’s native tab groups. A small team of junior operators inside your browser.
API and access
Bundled with ChatGPT Plus, Pro, Business, Edu, and Enterprise. Since April 2026, billing shifted to API token usage instead of per-message caps; Pro $200 gets 25x Plus quota through end of May. Developers can wire Codex up via the Codex CLI and desktop API for custom agent workflows.
This is the first release that makes Codex feel like an Agent product, not just an IDE assistant. Available everywhere except the EU and UK at launch.
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