OpenAI Codex — CLI, IDE, and cloud agent
Coding agent in the terminal, IDE, and cloud; cloud tasks run in sandboxes in parallel and return diffs or pull requests. By OpenAI. Where it runs: Terminal, IDE extension, Cloud. Pricing: Subscription, Pay per token, Open source.
- Strength: AGENTS.md conventions
- Strength: Sandboxed execution
- Strength: Included with ChatGPT plans
- Watch out: Cloud tasks need setup and test commands in AGENTS.md
- Watch out: Keep each task to one reviewable change
- Best for Background tasks: Run several cloud attempts at once and pick the best diff.
- Best for Terminal & automation: Open-source CLI with sandboxed approvals.
- Best for Hard bugs: Adjustable reasoning effort for stubborn failures.
- Best for Code review & PRs: Reviews pull requests and suggests fixes.
Frequently asked questions
What is OpenAI Codex best for?
Background tasks: Run several cloud attempts at once and pick the best diff. Terminal & automation: Open-source CLI with sandboxed approvals. Hard bugs: Adjustable reasoning effort for stubborn failures. Code review & PRs: Reviews pull requests and suggests fixes.
How do I write better prompts for OpenAI Codex?
Make sure AGENTS.md tells it how to install and test, so cloud tasks can verify. Run several cloud attempts for uncertain tasks and pick the best diff. Keep each task to one reviewable change.
What should I watch out for with OpenAI Codex?
Cloud tasks need setup and test commands in AGENTS.md. Keep each task to one reviewable change.
Related
- All AI agents & models
- Pairs well with GPT-5
- Pairs well with GPT-5 mini
- Estimate prompt tokens and cost
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