Codex
Free tier unverifiedOpenAI's coding agent for a repository, from ChatGPT, the CLI, or an IDE.
Official site · openai.com (opens in a new tab)
Quick answers
What is Codex best for?
- Codex is insufficient data and no numeric rank on Coding.
Does Codex have a free plan?
- A free plan is not on file for Codex.
What are the top alternatives to Codex?
- On Coding, the other tools are Cursor, ChatGPT, Aider, GitHub Copilot, and Claude Code.
Latest releases
GPT-6.1 Terra
OpenAI introduced GPT-6.1 Terra for ChatGPT Work and Codex, and in the API as gpt-6.1-terra at $1 per million input tokens and $5 per million output tokens. The English release notes date the rollout October 26, 2026, include Plus, Pro, Business, Enterprise, and Edu, and say Terra is available in Work and Codex, not Chat.
Composer predictions in Codex
Codex can suggest the next message from the current thread. You accept it with Tab, then review or edit it. Accepting a suggestion does not send it.
Scores
Coding · Insufficient data · composite 13.0 · coverage 26%
Insufficient data. Coverage is 26%, under 50% of the category weight, so this row has no numeric rank.
Codex score breakdown for Coding Metric Value Weight Normalized Source Free tier Not available 26% — Not available Entry monthly price $20PlusThe Codex page says Codex is included in your ChatGPT plan and lists Plus at $20. Pro is listed at $100. Business is $20 for two or more seats billed annually, so it is not the individual monthly entry price. The page does not list a free plan. An earlier read of the ChatGPT pricing page said Free includes limited Codex, and that page returned 403 on this pass, so free tier is left blank. 26% 50.0 Source for Entry monthly price (opens in a new tab)as of 2026-10-16 App Store rating Not available 16% — Not available App Store reviews Not available 12% — Not available Product-harness SWE-bench Not available 20% — Not available