Amazon CEO Andy Jassy. Andrej Sokolow/picture alliance via Getty Images The AI race has been about who has the best model. That is changing. Andy Jassy says customers want to use many different models and there won't be a single winner. Amazon is still building its own models to cut costs and move faster. Amazon's earnings on Thursday highlighted a surprising idea gaining traction across Silicon Valley: You don't need the best models to win in AI. The company reported blockbuster results, i...