Setup Tutorial
A focused desktop experience for AI-powered coding — run multiple tasks in parallel, review diffs, manage Git worktrees, and automate development workflows, all from one app.
Click the button below to download. It is free and takes less than a minute to install.
Follow these simple steps. No technical knowledge needed.
Click the "Download Codex App for Mac" button above. This will take you to the official Codex page at chatgpt.com/codex.
On the Codex page, click "Download for macOS". A .dmg file will download. Double-click it, then drag the Codex icon into your Applications folder — just like installing any other Mac app.
If your Mac says the app cannot be opened, go to System Settings → Privacy & Security and click Open Anyway.
Open the Codex app from your Applications folder. It will ask you to sign in. Use the same email and password you use for ChatGPT.
If you do not have a ChatGPT account yet, you can create one for free at chat.openai.com. However, you will need at least a Plus subscription ($20/month) for the best experience.
After signing in, Codex will ask you to select a folder to work in. Pick any folder on your computer that contains code or files you want to work with. Click "Open" to select it.
Type a message in the chat box at the bottom. Try something like "Tell me about this project" or "Build a simple webpage for me". Codex will start working on it right away.
Make sure "Local" is selected (not "Cloud") so Codex works directly on your computer. You will see Codex thinking, writing code, and making changes in real time.
When Codex finishes, it will show you exactly what files it created or changed. You can review the changes, accept them, or ask Codex to try again with different instructions.