To delete your Grok chat history, go to grok.com/app and remove conversations...

https://wiki-book.win/index.php/What_Should_I_Do_if_Grok_Delete_All_Doesn%E2%80%99t_Show_on_Mobile%3F

To delete your Grok chat history, go to grok.com/app and remove conversations manually. On X, clear your chat threads there too. Remember, files and Imagine media don’t delete automatically—they need to be removed separately