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

https://mega-wiki.win/index.php/Why_Can%E2%80%99t_I_Delete_Grok_Generated_Images_on_X_One_by_One%3F

To delete your Grok chat history, go to grok.com/app and clear conversations from your chat list. On X, remove messages directly from the thread. Remember, deleting chat doesn’t erase files or Imagine media—they need to be deleted separately