Microsoft Azure Pioneer-SCUS is a large GPU cluster operated by Microsoft, located in the United States, in the private sector. It came online around June 2021. At that moment it ranked number 18 among known clusters.
It is built on 1,312 NVIDIA A100. That amounts to about 414 H100e of AI compute. The cluster draws roughly 1.13 MW. Its hardware is estimated at $35M.
Epoch AI rates the certainty of this record as confirmed.