← Tuesday, October 20, 2026ArchitectureCase study
Meta is building Prometheus toward a million-GPU supercluster
Prometheus's first phase is complete, with Meta working toward roughly one million GPUs and using closed-loop liquid cooling. The scale and cooling approach matter to engineers planning infrastructure for large model training, though the excerpt offers few implementation details.
- What
- Prometheus is Meta’s phased, gigawatt-scale AI supercluster in New Albany, built to train foundational models.
- How
- Hundreds of thousands of GPUs span interconnected buildings, linked by miles of fiber and operating as one machine.
- Why it matters
- Reliability work achieved more than 85% pre-training goodput and more than 90% RL goodput; plans target roughly 1 million GPUs.
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