Elon Musk launched Grok 4 and Grok 4 Heavy. These xAI models are meant to challenge the speed, accuracy, and vision of OpenAI’s GPT-5 and Google’s Gemini.

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.”

Elon Musk's newly launched AI chatbot, Grok 4, seemed to reference Musk's posts on social media before answering controversial questions.