Codex Pass does not modify the official ChatGPT desktop app, and Codex still runs inside it. A ChatGPT account is signed in with the device-code method that Codex provides, and your password is entered only on the ChatGPT login page.
Your own account is signed in by you and used by you, so no account sharing is involved. We consider this use consistent with OpenAI’s account terms, and we have not observed accounts being banned because of it.
The terms between you and OpenAI continue to apply. Please connect only accounts you are entitled to use.
OpenAI does not publish its risk-control rules, and an account is occasionally asked to sign in again. For what to do and how to lower the risk, see My ChatGPT sign-in has expired.