Grok is xAI's large language model and AI assistant, created by Elon Musk's AI company. Available on X (Twitter) and via the grok.com web app, Grok stands out for its real-time access to X posts, its witty personality, and its willingness to discuss topics other AI systems refuse. Grok 3 (released February 2025) delivers frontier-level reasoning and coding capabilities with a 131K context window, image understanding, and a dedicated Deep Search mode for in-depth research. The API is available for developers via the xAI platform.