Grok is an AI chatbot and assistant developed by xAI, the artificial intelligence company founded by Elon Musk. Powered by the Grok 4 model family, it offers frontier capabilities in conversation, coding, reasoning, and voice interaction. Grok stands out with its real-time information access through the web and the X (formerly Twitter) platform, providing up-to-the-minute answers that other chatbots cannot match. The chatbot features the industry's largest context window at 2 million tokens, enabling it to process extremely long documents and conversations. Grok 3 and Grok 4 display significant improvements in reasoning, mathematics, and coding tasks. The platform also offers rich document creation, code generation, and advanced search capabilities. Grok is known for its witty and direct communication style, designed to answer questions with minimal filtering. The xAI API provides developer access starting at $0.20 per million input tokens for the budget-friendly Grok 4.1 Fast model, scaling up to $3/$15 per million tokens for the flagship Grok 4 model. New users receive $25 in free promotional credits upon signup.