AWS Fast BERT Training is a large GPU cluster operated by Amazon, located in the United States, in the private sector. It came online around December 2019. At that moment it ranked number 11 among known clusters.
It is built on 2,048 NVIDIA V100. That amounts to about 129 H100e of AI compute. The cluster draws roughly 1.36 MW. Its hardware is estimated at $40M.
Epoch AI rates the certainty of this record as confirmed.