xAI brings its 100,000-GPU Colossus cluster online
xAI brought Colossus online with 100,000 NVIDIA H100 GPUs to train Grok models after a roughly four-month build, creating the largest known single AI training cluster at the time.
TOWARD DOOM68confidence 94/100
Why it moved the index
A 100,000-GPU training system materially expanded one frontier laboratory's scaling capacity and intensified compute competition, with later NVIDIA evidence independently confirming the cluster's scale and use for Grok training.
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AUDIT TRAIL
Assessment history
- R1Toward 68 · confidence 94
New September 2024 frontier-compute milestone with later first-party hardware confirmation and no durable collision.
12 Aug 2026