OpenAI Codex
OpenAI's coding agent
OpenAI's coding agent, available in ChatGPT, a cloud agent, an IDE extension and the open-source Codex CLI (Apache-2.0). It can run parallel agents and review PRs.
Best for: Delegating parallel coding tasks and PR reviews, especially if you already pay for ChatGPT
Visit OpenAI Codex ↗86
score / 100
- Pricing
- Included in ChatGPT Plus ($20/mo), Pro ($100/mo), Business ($20/seat/mo annual, 2+ seats); or API key billing
- Free tier
- Yes: included with ChatGPT Free/Go plans, with usage limits
- Open source
- Yes
- Last verified
- 2026-10-15
Score breakdown
- Fit for the use case23 / 25
- Vibe-coder friendliness12 / 15
- Output quality & reliability13 / 15
- Pricing & free tier12 / 15
- Ecosystem & integrations8 / 10
- Momentum10 / 10
- Code ownership & lock-in8 / 10
Why this score: Strong agent with a free entry via ChatGPT and an open-source CLI (~129k GitHub stars), giving the best pricing and ownership mix among frontier agents.
Based on desk research of official pricing pages and docs; see methodology.