Meta details Ohio Prometheus AI supercluster

Meta published a detailed account of Prometheus, which it describes as a gigawatt-scale AI supercluster in New Albany, Ohio.[1] The company says the first phase is complete and trained its Muse foundation models, including Muse Wonder.[1] Meta is scaling the system toward roughly 1 million GPUs.[1] The campus had been a conventional data center serving web traffic two years before the report, giving the account a before-and-after view of the site’s role.[1] For teams evaluating AI infrastructure, the announcement links a large-scale buildout to a stated model-training use.

Meta says Prometheus currently runs two NVIDIA GPU platforms, both based on the NVL72 rack architecture.[1] The reported configuration has two racks with 36 GPUs per rack, a 1:1 CPU-to-GPU ratio, and 800G of scale-out bandwidth for every GPU.[1] Meta reports 720 PFLOPS of peak FP8 training compute and about 120 kW of power draw across the two racks.[1] The account also lists more than one exaflop of peak FP4 compute.[1]

Meta says Prometheus has shifted from file-based storage to multi-tiered cached object storage to reduce GPU idle time.[2] The company reports more than 85% goodput during Muse Wonder pre-training and more than 90% in reinforcement-learning runs.[1] Those figures describe reported goodput for two specific training stages; the account does not establish that the same rates apply to other models or workloads.[1] Meta also says firmware fixes pushed mean time between interruptions past 54,000 GPU hours.[1] Together, these details give infrastructure teams several operational measures to examine alongside headline compute capacity.

Meta says San Miguel will bring Vera Rubin NVL72 into the same network fabric as Prometheus.[1] The fabrics are tied together over distances ranging from 2 km to more than 100 km.[3] To manage power, Meta says Dynamo Dimmer gradually lowers GPU power limits as Prometheus approaches its electrical ceiling.[3] Meta also says it pays the full cost of energy at New Albany and matches its use with new clean and renewable power.[3]