Apple Inc.

(NASDAQ:AAPL) unveiled its biggest Siri AI upgrade in years at the Worldwide Developers Conference, but the more consequential announcement came behind the scenes: the company's most advanced AI model will run on NVIDIA Corp.

(NASDAQ:NVDA) chips through Alphabet Inc.'s (NASDAQ:GOOGL) Google Cloud rather than on Apple's own silicon.

Apple shares were little changed in Tuesday's premarket trading as investors weighed the improved Siri experience against the absence of fully autonomous AI features and Apple's growing reliance on external AI infrastructure.

Apple Shows More Functional Siri AI CNBC's MacKenzie Sigalos said Apple unveiled functional generative AI branded as Siri AI at WWDC.