SemiAnalysis9/16/2025

xAI’s Colossus 2 – First Gigawatt Datacenter In The World, Unique RL Methodology, Capital Raise

Jeremie Eliahou Ontiveros
xAI's Colossus 2 - First Gigawatt Datacenter In The World, Unique RL Methodology, Capital Raise On Site Turbines, Mississippi Expansion, Solaris Energy, Can xAI afford it?, Middle East Funding, Tesla, Talent Exodus, API revenue, Consumer Growth, RL Environment Much has been written about xAI’s Colossus 1. The Memphis build belongs in the history books: the largest AI training cluster, erected from scratch in 122 days. With roughly 200,000 H100/H200s and ~30,000 GB200 NVL72, it remains, today,...