EuroHPC Leonardo is a large GPU cluster operated by EuroHPC JU, located in Italy, in the public sector. It came online around November 2022. At that moment it ranked number 5 among known clusters.
It is built on 13,824 NVIDIA A100. That amounts to about 4.4K H100e of AI compute. The cluster draws roughly 12.6 MW. Its hardware is estimated at $281M.
Epoch AI rates the certainty of this record as confirmed.