xAI

Understand the Universe

xAI was founded in March 2023 by Elon Musk alongside researchers from DeepMind, Google, and Microsoft. The company develops advanced AI models under the Grok brand and operates at massive compute scale through its Colossus supercomputer cluster in Memphis, Tennessee. The company raised $6 billion in Series B funding at a $24 billion valuation in May 2024, followed by a $6 billion Series C at $50 billion in December 2024. In March 2025, xAI acquired X Corp. (formerly Twitter) for $33 billion. A $10 billion debt/equity raise in July 2025 valued the company above $120 billion. In January 2026, xAI closed a $20 billion Series E round with investors including Valor Equity Partners, Fidelity, Qatar Investment Authority, NVIDIA, and Cisco Investments. In February 2026, SpaceX acquired xAI in an all-stock deal valuing xAI at $250 billion. By March 2026, all original co-founders except Elon Musk had departed the company. xAI's flagship product, Grok, serves approximately 600 million monthly active users across the X platform and Grok mobile apps. The latest model, Grok 4.20, features a 2 million token context window and is available via API with pricing starting at $2.00/$6.00 per million input/output tokens. Grok 5 is currently in training. Beyond language models, xAI offers Grok Voice (real-time voice agent API), Grok Imagine (image and video generation), Grokipedia (AI-powered knowledge base), and an AI Game Studio. The company holds a $200 million contract with the U.S. Department of Defense for military AI applications.