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Getting Started with OpenAI Codex: Desktop App, CLI, IDE Extension, Cloud and Installation on Windows

The first decision when starting with Codex is the sign-in method: Codex Cloud and GitHub code review work only with a ChatGPT account, while an API key gives local use only. Installing on Windows with the standalone installer, npm and WSL 2, the difference between the desktop app, CLI, IDE extension and cloud surfaces, why you should open the session at the repo root, and a first small, test-verified change in Bookstore.