Apple Inc. (Apple (AAPL)) just made its biggest Siri AI play in years at the Worldwide Developers Conference, but the real headline might be what's powering it behind the scenes: NVIDIA chips and Google Cloud, not Apple's own silicon.

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 reported that Apple unveiled functional generative AI branded as Siri AI at WWDC. The new Siri is more conversational, has a standalone app, can understand what appears on a user's screen, and can draw on personal context. But Apple didn't show a fully agentic assistant capable of tasks like booking dinner reservations or calling a car.

Sigalos said the lack of groundbreaking agentic capabilities helped explain the stock reaction, along with the absence of incoming CEO John Ternus from the stage and the lack of a clear path to monetize AI through Apple's services business.

Apple Turns To Google Gemini, NVIDIA, And Google Cloud

The announcement also marked a significant departure from Apple's longstanding hardware strategy. At WWDC 2026, the company disclosed that its most advanced frontier AI model, AFM 3 Cloud Pro, is designed to run on NVIDIA graphics processors rather than its own Silicon.

Sigalos said Apple announced a new generation of its own large language models built with help from Google Gemini. Those models will run on-device and through private cloud compute. However, Apple waited until a post-keynote briefing to discuss AFM Cloud Pro, a model it says is on par with frontier LLMs and powerful enough that Apple will need NVIDIA chips and Google Cloud for some compute. That marks a notable shift from Apple's usual preference for private cloud infrastructure built around its own M-series chips.

Services Monetization Remains The Key Question

Sigalos noted that Apple's private cloud setup reportedly could not support the scale needed for agentic workflows and complex reasoning, raising questions about the company's future capital spending needs. She also said the headline gave NVIDIA shares a boost.

The company's biggest upside could come from turning AI into a services opportunity. Sigalos said Apple could eventually offer a paid Apple Intelligence tier or take a cut from third-party model makers if it allows them to plug into its ecosystem. The bull case, she said, is that Apple turns AI into a consumer "toll booth" for generative AI.

Price Action: NVIDIA shares were up 0.77% at $210.24, and Apple shares were down 0.03% at $301.44 during premarket trading on Tuesday, according to market data.