Procedure
Install OpenAI Codex CLI
Install OpenAI Codex CLI via the official install script, npm package @openai/codex, or Homebrew cask, then verify with codex --version. Do not install the unrelated unscoped npm package named codex.
Install Codex CLI per https://github.com/openai/codex . macOS/Linux: cur
Install Codex CLI per https://github.com/openai/codex . macOS/Linux: curl -fsSL https://chatgpt.com/codex/install.sh | sh . Or npm (Node.js required): npm install -g @openai/codex — use the scoped name @openai/codex only. macOS alternative: brew install --cask codex . Windows: use the npm global install or the Windows installer guidance on that README.
Open a new terminal so codex is on PATH. Optional: run codex and complet
Open a new terminal so codex is on PATH. Optional: run codex and complete ChatGPT/OpenAI auth when prompted.
codex --version
codex --version
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