Argonne NL Sophia (Formerly Theta) is a large GPU cluster operated by US Department of Energy, located in the United States, in the public sector. It came online around May 2020. At that moment it ranked number 38 among known clusters.
It is built on 192 NVIDIA A100. That amounts to about 60.54 H100e of AI compute. The cluster draws roughly 0.17 MW. Its hardware is estimated at $5M.
Epoch AI rates the certainty of this record as confirmed. This was originally an addition of a GPU portion of the Theta supercomputer. The Theta supercomputer has since been retired, and these GPUs were shifted to the Sophia supercomputer