"As you can tell from all the many collaborations on so many fronts with SpaceX, and there's a lot. There's more and more overlap, especially with Terafab," Musk said. The two companies Musk controls are already deeply intertwined, even financially. Grok, the AI model from Musk's xAI, is being embedded in Tesla vehicles and, Musk said, helping power the "digital" version of the Optimus robot. REUTERS/Steve Nesius · Reuters / REUTERSThen there is Terafab, the chipmaking venture Musk said was as the biggest area of overlap.