Apple Rebuilds Siri on a Custom 1.2-Trillion-Parameter Gemini in Tim Cook's Farewell WWDC Keynote — Google Powers the Heaviest Reasoning Tier

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At WWDC 2026 on June 8, Craig Federighi confirmed Apple 'partnered deeply with Google to leverage the technology behind the Gemini family of models to co-create the next generation of Apple Foundation Models,' running a custom ~1.2T-parameter Gemini build on Apple's Private Cloud Compute for the heaviest Siri AI queries — reportedly ~$1B/year. The reveal came in Tim Cook's final keynote before he steps down as CEO on September 1, handing off to hardware chief John Ternus. For builders: the most-distributed assistant on Earth (2B+ devices) now routes its hardest reasoning to Gemini, a structural win for Google's model business and a public concession that Apple couldn't reach the frontier alone.