xAI starts training on 100,000-H100 Memphis cluster
xAI began model training in Memphis on a single fabric connecting 100,000 liquid-cooled NVIDIA H100 GPUs; contemporary reporting preserved the dated announcement and later NVIDIA documentation confirmed the completed cluster scale.
TOWARD DOOM64confidence 90/100
Why it moved the index
Operating a 100,000-GPU training fabric materially concentrated frontier compute and escalated competitive pressure to train larger models on shorter schedules.
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AUDIT TRAIL
Assessment history
- R1Toward 64 · confidence 90
New July 2024 completed frontier-compute training-cluster activation.
12 Aug 2026