You already pay for ChatGPT, and paying again for API tokens just to try a terminal coding agent is a hurdle that does not need to exist. Codex CLI is OpenAI's coding agent that runs locally on your computer, and the README says you can sign in with the ChatGPT plan you have. This is the short path from zero to a first task, using the commands from the README. The condensed version lives on the Deduped use-case page .

Install it

On macOS or Linux the README quickstart is:

curl -fsSL https://chatgpt.com/codex/install.sh | sh

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That pipes a remote script into your shell.…