OpenAI open-sources Codex CLI, a coding agent that runs in the terminal, alongside o3 and o4-mini

OpenAI/Codex

Alongside reasoning models o3 and o4-mini, OpenAI released Codex CLI, a lightweight open-source coding agent that runs locally in the terminal without cloud dependency. It accepts screenshots or sketches as input and can search code, edit files, write tests and push to GitHub. OpenAI also announced a $1M fund of API-credit grants for projects built on it.

• Codex CLI runs locally in terminal; accepts screenshots and sketches as input
• Can search code, edit files, write tests, push to GitHub; keeps developers informed throughout
• Open-source release; independent from o3 and o4-mini reasoning models
• OpenAI created $1M fund of API-credit grants for projects using Codex CLI