OpenAI shares how it uses Codex for daily engineering work
Original: you can also see how OpenAI uses Codex in
Source: github.com ↗
Who: Posted by Gabriel Chua on X, sharing the OpenAI Codex repository on GitHub, which is maintained by OpenAI, the lab behind ChatGPT.
What's new: OpenAI has published the source code for , a lightweight that runs inside your computer's terminal. The tool lets you describe a programming task in plain English and have an AI model carry it out by reading and editing files on your machine. It has accumulated over 84,000 stars on GitHub, signaling strong interest from the developer community.
How it works: Codex CLI connects to OpenAI's models — either through a subscription or a separate — and runs locally, meaning your files stay on your own computer rather than being uploaded to a web interface. The repository also contains a -heavy codebase alongside a desktop app and a cloud-based sibling called .
Why it matters: Making the source code public means developers can inspect how it works, contribute improvements, and build their own versions — which explains the 12,000-plus forks already made from the repository. It also signals that OpenAI sees locally-running AI coding tools as a serious product line, not just a side experiment.