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. Understand unfamiliar codebases : Codex can read and explain complex or legacy code, helping you grasp how teams organize systems. Review code : Codex analyzes code to identify potential bugs, logic errors, and unhandled edge cases. Debug and fix problems : When something breaks, Codex helps trace failures, diagnose root causes, and suggest targeted fixes. Automate development tasks : Codex can run repetitive workflows such as refactoring, testing, migrations, and setup tasks so you can focus on higher-level engineering work. Get started with Codex Quickstart Download and start building with Codex. Get started Explore use cases Get inspiration on what you can build with Codex. Learn more Community Read community posts, explore meetups, and connect with Codex builders. See community Codex for Open Source Apply or nominate maintainers for API credits, ChatGPT Pro with Codex, and selective Codex Security access. Learn more