Some say it is the strangest book ever published. With an invented alphabet and surreal illustrations, the Codex Seraphinianus continues to fascinate curious readers, dedicated codebreakers, and deep ...
The best way to build with agents. Codex accelerates real engineering work, from planning and building features to refactors, reviews, and releases—working seamlessly across your tools.
The Codex app is a focused desktop experience for working on Codex threads in parallel, with built-in worktree support, automations, and Git functionality. ChatGPT Plus, Pro, Business, Edu, and Enterprise plans include Codex. Learn more about what’s included.
Codex CLI is OpenAI’s coding agent that you can run locally from your terminal. It can read, change, and run code on your machine in the selected directory. It’s open source and built in Rust for speed and efficiency. ChatGPT Plus, Pro, Business, Edu, and Enterprise plans include Codex. Learn more about what’s included.
Codex is included in your ChatGPT Free, Go, Plus, Pro, Business, Edu, or Enterprise plan
Codex can perform tasks for you such as writing features, answering questions about your codebase, fixing bugs, and proposing pull requests for review; each task runs in its own cloud sandbox environment, preloaded with your repository. Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering.
Codex One agent for everywhere you code Codex is OpenAI’s coding agent for software development. ChatGPT Plus, Pro, Business, Edu, and Enterprise plans include Codex. It can help you: Write code: Describe what you want to build, and Codex generates code that matches your intent, adapting to your existing project structure and conventions.