OpenAI Codex CLI

Frontier reasoning in the terminal

Open Source

Developer Tools

GitHub

For developers who live in the terminal and want ChatGPT‑level reasoning plus the power to actually run code, manipulate files, and iterate – all under version control. In short, it’s chat‑driven development that understands and executes your repo.

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OpenAI's answer to Claude Code.

Not be confused with Codex CLI by Microsoft, nor OpenAI Codex, which was launched in 2021!