xAI's Colossus 2 supercomputer has just gone live, marking a major milestone as the industry's first training cluster operating at gigawatt scale. The system is already breaking new ground with its 1 GW capacity, demonstrating the scale of computational resources now being deployed for next-generation AI model development. Even more significant: the infrastructure roadmap calls for a major power upgrade to 1.5 GW by April, effectively expanding the cluster's training throughput by 50% within months. This kind of computational firepower represents a fundamental shift in how advanced AI systems are being built, with real implications for the pace of innovation across the space.