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xAI
Elon Musk's AI lab, competing directly with OpenAI and Anthropic in frontier LLMs. Builds the Grok model family, trained on xAI's Colossus cluster (200,000 H100s) using large-scale reinforcement learning. Grok 4 Heavy scores 50.7% on Humanity's Last Exam and 15.9% on ARC-AGI V2. API access available; Grok-1 weights (314B MoE, Apache 2.0) are open-source.
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