Grok is Elon Musk's AI chatbot, built right into X (formerly Twitter). It's developed by xAI, which is now part of SpaceX. The latest version, Grok 4.7, came out in September 2026: it is mainly better at writing code and handling long tasks. Grok is known for its more direct, less filtered responses compared to competitors, and it has real-time access to posts on X.