Apple has now leapfrogged leaders Microsoft and Google in the high-stakes AI race by promising the first killer use of AI - a true personal assistant, in the form of.... the iPhone. Even the stock, once a laggard, has jumped to historic highs, anchored by Apple's singular combination of hardware, software and data. But its biggest edge over AI devices like the Humane pin and Rabbit R1 is that it's already in billions of consumers' pockets. This week on TechCheck, Apple takes the AI lead.