Codex CLI
OpenAI
Why it is on the list
Open source, 88,600+ stars; a simple task drops to a cheaper tier without a human decision.
Facts with sources
- One agent across terminal, IDE, web, and cloud. Source (in Russian)
- Terminal-Bench 4.0: Codex + GPT-6 Astra on high effort solves 57.88% of tasks at $2.3K per run; switching to max adds 0.3 points and a thousand dollars. Source (in Russian)
- OpenAI blocks access by IP; most popular VPNs are detected. Source (in Russian)
Who it is for
- Engineering team that cares about open source
- Team already on a ChatGPT plan with billing in place