Explore AI
Codex CLI
Terminal agent · OpenAI
- Kind
- Terminal agent
- Made by
- OpenAI
- Verified
- 125,498 stars · Apache-2.0 · last commit 2026-09-20
- Cost
- Free software; model usage billed separately.
- Repository
- openai/codex
What it is
OpenAI's terminal agent, released under a permissive licence and usable with other providers' models.
Who it is for
Terminal users who want a choice of model rather than one vendor.
Why we would pick it
Apache-2.0 and actively developed. A rare case of a lab open-sourcing its own front end.
What to watch
Younger than the alternatives; its behaviour and defaults still change often.