WWDC 2026: Gemini-powered Siri, and an iOS 27 slot for third-party assistants

Apple opened WWDC today (June 8) with a rebuilt Siri backed by a custom ~1.2-trillion-parameter Gemini model licensed from Google (reportedly ~$1B/year), adding a chat mode and personal-context features. The part that matters for engineers: iOS 27 Extensions let users pick a third-party AI model as their default assistant, and Siri can hand questions off to installed services like Claude or Gemini — a new, OS-level distribution surface for AI apps. Developer betas are out now, public betas in July, GA in the fall.

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Sources: TechCrunch: what to expect · MacRumors WWDC 2026 guide · Apple Developer: WWDC26