Working on a project this weekend? Try Codex CLI with GPT-5, included in your ChatGPT plan! ❯ npm i -g @openai/codex
❯ codex Pro tip! Use GPT-5 with high reasoning via this shortcut:
❯ codex -m gpt-5 -c model_reasoning_effort="high" Or type /model to pick interactively:

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