I just clicked "Upgrade" in the macOS Codex Desktop app and it relaunched with a new name, "ChatGPT". My existing install of the macOS ChatGPT app seems to have been renamed "ChatGPT Classic".
just commented ton Tibo's post; they should have made things clearer and told us if the macOS ChatGPT app was going away. So I could either delete it or not be surprised when it rolls into something else :(