xAI
Company
AI Labs & Software
Elon Musk's lab: Grok models and the fastest data-center build ever seen.
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xAI's defining achievement is industrial: Colossus in Memphis went from empty shell to a ~100,000-GPU training cluster in 122 days, then kept doubling — with on-site gas turbines bridging grid delays and a second gigawatt-class campus under way. Merged with X (Twitter) in March 2025, it trains the Grok family and monetizes through X subscriptions and an API.
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Record reviewed as of 2026-01-15 — see Methodology.