OpenAI's coding agent for the terminal, IDE, cloud and ChatGPT apps.
Codex is OpenAI's coding agent. The open-source Codex CLI (Apache-2.0) runs locally in the terminal; the IDE extension works in VS Code, Cursor and Windsurf, with JetBrains and Xcode integrations; Codex Cloud runs tasks in the background. It uses OpenAI's GPT-6 family and supports MCP servers. It is included in every ChatGPT plan, from Free upward, or usable with an API key.
Included in ChatGPT Free, Go ($8/mo), Plus ($20/mo), Pro (from $100/mo), Business ($25/user/mo monthly, $20 annually), Edu and Enterprise; or API-key usage billing.
pricing details · as of 2026-11-02
long description · as of 2026-11-02