Grok is built by Elon Musk's xAI and is notable for its real-time awareness via X data, unfiltered personality, and competitive coding and data-analysis capabilities. It supports image generation, document analysis, and runs both inside the X platform and as a standalone app. Grok's context window and reasoning mode make it a strong alternative to ChatGPT and Claude for technical and research tasks. Free access is available on X, with SuperGrok plans for heavier usage.