In a late-night announcement, X owner Elon Musk unveiled the new Grok 4 chatbot. Here's everything you need to know about it.

This is the smartest AI in the world,” Musk said. He did not mention the chatbot’s viral posts praising Hitler and calling itself “MechaHitler.”

In a high-profile livestream on X (formerly Twitter), Elon Musk and his xAI team pulled back the curtain on Grok 4 — the latest evolution of their artificial intelligence chatbot. Billed as the most capable version yet, Grok 4 is being positioned not just as a digital assistant, but as a kind of intellectual superweapon.