Elon Musk's AI company; builds the Grok models and the large Colossus GPU cluster.
xAI released Grok 4.5 at $2/$6 per million input/output tokens — versus $5/$25 for Anthropic's Opus 4.8 and $5/$30 for OpenAI's GPT-5.6 Sol — claiming double token efficiency. Independent evals rank it competitive but fourth on capability.
US private AI investment hit $109B in 2024 — then 2025's efficiency shock (DeepSeek) made the bubble question sharper, not simpler. Our read on whether capital is ahead of capability. (Our opinion, not investment advice.)
xAI (Colossus) — Colossus scaled to ~200,000 GPUs and gigawatt-class power as GB200 racks came online — the first single site to approach 1 GW of AI compute.
xAI (Colossus) — xAI brought its Colossus cluster in Memphis online with ~100,000 H100 GPUs (~150 MW), built in months — the first single cluster at six-figure GPU scale.
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OpenAI 
Anthropic