MTS Grom is a large GPU cluster operated by MTS, located in Russia, in the private sector. It came online around June 2021. At that moment it ranked number 91 among known clusters.
It is built on 160 NVIDIA A100. That amounts to about 50.45 H100e of AI compute. The cluster draws roughly 0.14 MW. Its hardware is estimated at $4M.
Epoch AI rates the certainty of this record as confirmed.