Musk says Colossus 2 in Memphis is operational as the first gigawatt-scale AI training cluster

xAI/Colossus

Elon Musk said the Colossus 2 supercomputer for Grok was operational and called it the world's first gigawatt training cluster, with an upgrade to 1.5 GW planned for April. Researchers at Epoch AI later questioned the claim, citing satellite images showing about 350 MW of cooling capacity.

• Musk claims Colossus 2 is first operational gigawatt-scale AI training cluster with April upgrade to 1.5 GW planned
• Epoch AI researchers questioned claim citing satellite images indicating approximately 350 MW of cooling capacity
• Discrepancy between claimed and observed capacity raises questions about operational status and full capability realisation
• Serves as training cluster for Grok AI model; central to xAI's compute expansion plans