Elon Musk shared a late-night X post highlighting the intense work at SpaceXAI, AI division integrated into SpaceX after a $250 billion acquisition of xAI. "I…left SpaceXAI office at nearly 2:45 am…We might be close to a significant breakthrough in [AI] training," Musk wrote. The division trains massive models like Grok on Colossus supercomputer equipped with over 2,20,000 Nvidia GPUs.