Codex is an open-source coding agent built by OpenAI at https://github.com/openai/codex.

Model

Codex uses the codex-mini model from OpenAI.

Memory & Project docs

You can give Codex extra instructions and guidance using AGENTS.md file in the repository root.

Security & responsible AI

Have you discovered a vulnerability or have concerns about the model output? Please e-mail security@openai.com, and we will respond promptly.