OpenAI Codex
OpenAI's coding agent for the terminal, IDE and cloud, included in every ChatGPT plan
What is OpenAI Codex?
OpenAI Codex is a coding agent from OpenAI that writes features, fixes bugs and proposes pull requests, either locally through its open-source CLI and IDE extension or in cloud sandboxes. It is included in every ChatGPT plan, including Free for quick tasks. Paid plans raise the usage limits.
Pros
- Available on the free ChatGPT plan
- Runs locally or in cloud sandboxes
- CLI is open source (Apache-2.0)
Cons
- Free and Go limits are tight for daily work
- Cloud tasks need a GitHub-connected repo
- Usage limits differ by plan and can be hard to predict
Where OpenAI Codex ranks
Alternatives
OpenAI Codex alternatives
Cline
Open-source coding agent for VS Code that uses any model you bring
Jules
Google's asynchronous coding agent that works on your GitHub repo and opens PRs
Aider
Open-source AI pair programmer that edits code in your terminal with git commits
Claude Code
Anthropic's coding agent that edits, runs and ships code from your terminal or IDE
Cursor
AI code editor with an agent that makes changes across your whole project
Devin
Autonomous software engineer from Cognition, now with the Devin Desktop editor
OpenAI Codex FAQ
What is OpenAI Codex?
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OpenAI Codex is a coding agent from OpenAI that writes features, fixes bugs and proposes pull requests, either locally through its open-source CLI and IDE extension or in cloud sandboxes. It is included in every ChatGPT plan, including Free for quick tasks. Paid plans raise the usage limits.
How much does OpenAI Codex cost?
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OpenAI Codex pricing starts at $8/mo, and there is a free plan. Included in ChatGPT Free, Go ($8), Plus ($20), Pro (from $100), Business and Enterprise. Check openai.com for current plans.
Is OpenAI Codex free?
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Yes. OpenAI Codex has a free plan, with paid plans for more usage.
Is OpenAI Codex an autonomous AI agent?
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We rate OpenAI Codex as "Task agent": completes tasks you hand it, then reports back.
What are the best OpenAI Codex alternatives?
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Popular alternatives to OpenAI Codex are Cline, Jules, Aider, Claude Code, Cursor.