xAI, officially X.AI Corp, is an American artificial intelligence (AI) company founded by Elon Musk on March 9, 2023. Its mission is to "understand the true nature of the universe" and accelerate scientific discovery. In February 2026, SpaceX acquired xAI in an all-stock transaction, making xAI a wholly-owned subsidiary. The acquisition valued SpaceX at $1 trillion and xAI at $250 billion. xAI is headquartered in the San Francisco Bay Area, with offices including Palo Alto, Seattle, San Francisco, Memphis, Tennessee, and London, UK. Elon Musk is the CEO, and Anthony Armstrong is the CFO. Other key executives include Igor Babuschkin (AI Research Lead), Jimmy Ba (AI Model Optimization Lead), and Daniel Rowland (Data Center Operations Lead). However, four co-founders, Christian Szegedy, Igor Babuschkin, Greg Yang, and Yuhuai Wu, have recently resigned from the company.
xAI's flagship products include Grok, a generative AI chatbot, and the social media platform X (formerly Twitter), which it acquired in March 2025. Grok is designed to be a versatile AI assistant with real-time search, coding capabilities, and complex reasoning. xAI also released Aurora, a text-to-image model, and Grokipedia, an AI-powered online encyclopedia. xAI has been building its AI compute stack, including Colossus, a large AI supercomputer. As of January 2026, Nasdaq Private Market estimated xAI's price per share at $68.83. xAI has raised substantial funding, including a $20 billion Series E round in early 2026. The company's developments include Grok-4 and Grok Heavy, with the latter costing $300/month for access at launch. xAI is developing a Seattle-area engineering center in Bellevue, Washington.