CLI Installation & Authentication in AI
From the OpenAI Codex cheat sheet · Installation & Setup · verified Jul 2026
CLI Installation & Authentication
Install with the standalone installer, verify the CLI, and sign in.
bash
# Standalone installer: macOS and Linux
curl -fsSL https://chatgpt.com/codex/install.sh | sh
# Standalone installer: Windows PowerShell
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
# Verify the installed release
codex --version
# Start Codex and choose Sign in with ChatGPT
codex🟢 The official quickstart leads with the standalone installers
⚡ Rerun the standalone installer to update Codex
📌 npm and Homebrew remain supported alternatives
🔐 Run codex and choose Sign in with ChatGPT on first launch
installationauthenticationclistandalone
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