Codex CLI
An open-source, terminal-based AI coding agent by OpenAI that automates repository tasks, reviews pull requests, and runs tests in sandboxed environments.
Free + paidmacOSLinuxWindows (WSL2)Open source
Visit websiteopenai.com
Compare with book-to-skillExplore Codex CLI alternativesOverview
Codex CLI is a terminal-based open-source AI coding agent developed by OpenAI. It helps developers automatically generate, modify, and analyze code using natural language commands without leaving the terminal environment. It runs and tests code within a sandbox environment and automates commit message writing and pull request (PR) generation through Git integration, greatly enhancing developer productivity.
Key features
- Terminal-based execution (CLI)
- Execution in an isolated cloud sandbox
- Natural language-based code generation and editing
- Automated testing and debugging loop
- Git and GitHub workflow integration (automatic PR generation)
- Custom skill expansion (SKILL.md)
Pricing
Use cases
- Code autocompletion and large-scale refactoring
- Analyzing new project/repository structures and code
- Automatic generation of unit test and integration test code
- Writing Git commit messages and Pull Request descriptions
- Reviewing code security and vulnerabilities
Who it is for
Software engineersDevOps engineersDevelopers who prefer terminal environmentsOpen-source contributors
How we verified this
Company, pricing, and feature details come from the primary sources below and our latest verification pass. When sources disagree, the official source and the most recent check win.
Last verified 09/06/2026Verified sources: 1
Alternatives
Tools you can use instead
book-to-skill
Converts technical books and document collections into structured, on-demand skills for AI coding agents.
★ 28.8KOpen source
Developer Tools
GPT-6 Astra
OpenAI frontier model for difficult end-to-end reasoning and professional work.
API
Developer Tools
