xAI Built a Massive Supercomputer in Four Months, Not Two Years

xAI completed its Colossus supercomputer—running 150,000 graphics processors—in four months instead of the typical two-year timeline. The speed came from reusing existing data centers and leveraging established supplier relationships, avoiding the facility preparation and equipment delays that usually slow large-scale projects. Colossus now operates at 99% uptime, with plans to scale to one million processors.