AI · ReviewedindustryAI-rewritten · Llama 3.1 (70B)
xAI's Colossus 2 Datacenter Breaks Ground
Originally published Sep 16, 2025
By Jeremie Eliahou Ontiveros · Semianalysis
AI-generated summary based on Semianalysis · Aggregated by OffScreenSpace · Human-reviewed and approved on May 29, 2026
Key points
- Colossus 2 is the first gigawatt datacenter in the world
- xAI's Colossus 1 was built in just 122 days
- Colossus 1 remains the largest single-coherent AI cluster
xAI is building Colossus 2, a gigawatt datacenter that follows the success of Colossus 1, the largest AI training cluster in the world. Colossus 1 was built from scratch in just 122 days and remains the largest fully operational single-coherent cluster. The new datacenter will utilize a unique reinforcement learning methodology.
Read the original story: Semianalysis