CMF Headphone Pro supports ChatGPT. Ensure you're following the below steps:
1. Update your Nothing phone to the latest system version.
2. Update and use the latest Nothing X app from the Google Play Store.
3. Download, install and log into the ChatGPT app from Google Play Store, and use the ChatGPT Voice function at least once.
4. In the Nothing X app, go to Controls, then set ChatGPT as the action for Single Press or Press & Hold gestures and apply the setting.
*Please note that this is compatible with Nothing and CMF Phones only.
If the issue persists, contact Nothing Support for further assistance.