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xAI is an artificial intelligence company founded by Elon Musk in March 2023, best known for developing the Grok chatbot, which draws on real-time information from X. In February 2026, SpaceX acquired xAI in an all-stock deal valuing xAI at $250 billion and the combined company at $1.25 trillion, and xAI now operates as SpaceX's AI division, reflected in its GitHub organization's rebrand to SpaceXAI. Its open releases include the Grok-1 model weights and the ranking algorithm behind X's "For You" feed.