Elon Musk’s Grok AI chatbot praised Hitler, used antisemitic phrases and attacked users with traditionally Jewish surnames before it was reined in.

Elon Musk appeared to give a mocking response to his artificial intelligence chatbot’s Hitler-praising comments on X. On Tuesday, the chatbot called Grok—created by Musk’s company xAI—started giving unhinged responses to users on the billionaire’s social media platform.