Colossus supercomputer complex
Active
xAI
Overview
The Memphis-area AI training complex built in 122 days in 2024, now ~555,000 Nvidia GPUs (H100/H200/GB200) across Colossus 1 and the gigawatt-class Colossus 2, targeting 1M+ GPUs and ~2 GW. xAI trains Grok 5 on Colossus 2 while leasing Colossus 1 to Anthropic and capacity to Google — though its gas turbines are the subject of an NAACP emissions lawsuit.
Colossus 1 (~220K GPUs, 300 MW) fully leased to Anthropic at $1.25B/month through May 2029; Colossus 2 hosts xAI's own frontier training plus Google's 110K-GPU contract from October 2026. NAACP suit over turbine emissions filed April 2026; the Trump administration moved to intervene and dismiss in June 2026.