OpenAI Codex
OpenAI's coding agent for the app, editor, terminal and cloud.
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About OpenAI Codex
Codex is an AI coding agent from OpenAI, built on ChatGPT. You give it a goal and it gathers context, takes action and returns work for you to review. It can explore and explain code, build features, fix bugs, refactor and review pull requests, and it can run many agents in parallel, using computer and browser tools to check its work.
Cloud environments for each repository let tasks keep running when you close your laptop, so you can start a task on one device and pick it up on another. Codex integrates with GitHub and can review pull requests automatically, and plugins connect it to your other apps. You can use it in the ChatGPT desktop app for macOS and Windows, on the web, on mobile, in an IDE extension and in the command line.
Codex is included in ChatGPT plans rather than sold separately. The Free plan has limited access, Plus includes usage for focused coding sessions each week, Pro has higher limits for full workdays across projects, and Business adds a shared workspace with admin controls.
Our take
- Good for
- developers who want a coding agent in the app, editor, terminal and cloud, using their ChatGPT plan.
- Skip it if
- you want a fixed allowance you can predict.
- The catch
- it draws on a shared allowance tied to your ChatGPT plan, limits have changed before, and sources describe the higher tiers differently, so check the live pricing page.
Checked . Plans and limits change, so confirm them on the vendor's site before you buy.