One command.
That is the setup.

It installs Codex CLI and every tool it needs, then checks that the command actually works. Copy the line for your computer, paste it into the named terminal, and press Enter.

Choose your terminal

Copy one line.

Mac or Linux

Open Terminal: press Command + Space, type “Terminal”, press Enter

$ curl -fsSL https://raw.githubusercontent.com/jtlgrowth/codex-cli-installer/main/install.sh | bash

Windows PowerShell

Open PowerShell: press the Windows key, type “PowerShell”, press Enter

> irm https://raw.githubusercontent.com/jtlgrowth/codex-cli-installer/main/install.ps1 | iex

Windows Command Prompt

Use this if the window says “Command Prompt” or “cmd”, or if the PowerShell line turned red

> powershell -NoProfile -ExecutionPolicy Bypass -Command "irm https://raw.githubusercontent.com/jtlgrowth/codex-cli-installer/main/install.ps1 | iex"

Then

Three steps and you are working.

Close the terminal and open a new one. The new window loads the command that was just installed.
Type codex login, press Enter, and sign in with your ChatGPT account in the browser.
Type codex and press Enter. That is it: Codex is running.

Got an access code from us? Our setup and hire skills live at jtlgrowth.com/skills.

If it does not work

The common fixes.

codex: command not found

Close the terminal, open a new one, and try again. The old window still has the PATH it started with.

Windows says 'irm' is not recognized

You are in Command Prompt. Use the Command Prompt box above. It starts PowerShell for the installation without changing your default terminal.

Windows says scripts are disabled

Use the Command Prompt box above. It applies the bypass to that one install command only.

The installer is open source. Read the installer, or check the official Codex documentation.