Codex app on macOS

1. Download the Codex macOS app from OpenAI.
2. Drag the Codex icon into Applications.
3. Open Codex and sign in.
4. Select the folder or git repo where Codex will work.
5. Start your first task.

Codex CLI on macOS

Prereq: Node.js + npm installed.

1. Install the CLI: npm install -g @openai/codex
2. From your project root, run: codex
3. Choose your approval mode if needed: codex --suggest codex --auto-edit codex --full-auto
4. Update anytime: codex --upgrade