To delete your Grok chat history on grok.com/app or X, go to your chat settings...

https://zaneznae304.lucialpiazzale.com/how-do-i-cancel-a-grok-subscription-after-deleting-my-chats

To delete your Grok chat history on grok.com/app or X, go to your chat settings and choose Delete History. Remember, deleting chat doesn’t remove files or Imagine media—you’ll need to delete those separately