As artificial intelligence steps out of the digital realm and into the real world, the race to build the embodied “brains” powering next-generation robots has become the newest battleground in tech competition between China and the United States. Two days after US chip giant Nvidia launched its Cosmos 3 model – designed to help physical AI “think before it acts” – a Chinese start-up stole the spotlight. On Wednesday, Hangzhou, Zhejiang province-based Spirit AI said its foundation model for...