Elon Musk's AI company; builds the Grok models and the large Colossus GPU cluster.
Frontier clusters went from 150 MW in 2023 to gigawatt-class in 2025, and the binding constraint is now power rather than chips. Four hyperscalers guide over $300B a year combined — the fastest capex ramp in corporate history.
OpenAI notified SpaceX on 28 August that it will wind down Cursor's access to its models, proposing a 12 November shutoff, two weeks after SpaceX closed its $60B purchase of Anysphere. OpenAI cites an inability to be confident the terms of service will be honoured, pointing to Musk's sworn testimony that xAI distilled OpenAI models. Cursor says OpenAI models are about 5% of its traffic.
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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Meta AI 
Microsoft (Azure Quantum) 
OpenAI 
SpaceX 
Anthropic