WWDC 2026: Claude Joins Siri in Apple’s Multi-AI Extensions
3 min readTim Cook walked on stage at Apple Park for his last WWDC keynote on Monday and used it to do something Apple has resisted for nearly a decade: make Siri pluggable. Alongside iOS 27 Beta 1, which shipped the same afternoon, Apple unveiled a multi-AI Extensions system that adds Claude as a first-party option on iPhone and confirmed the long-rumored Gemini-powered rewrite of Siri.
From One Voice to Many
Siri has been a single-vendor assistant since its 2011 debut, and Apple has spent the last two years quietly trying to fix its limitations with an in-house large model that never shipped. The WWDC 2026 announcement reverses that strategy. Instead of one Apple model, iOS 27 lets users pick which assistant answers when they say “Siri”: a new Apple-tuned variant of Google Gemini by default, with Anthropic Claude and OpenAI ChatGPT available as switchable Extensions in Settings.
What Apple Announced
The core of the keynote was a $1 billion per year licensing deal with Google to host a custom Gemini build that runs Siri’s natural language and reasoning layer, confirming reports that surfaced last week. Apple framed the deal as a temporary bridge while it continues training its own foundation model, but the bigger news was the Extensions architecture sitting on top of it. Developers can register any approved model as a Siri provider, and Anthropic confirmed during the keynote that Claude Opus 4.8 is shipping as a launch partner.
iOS 27 Beta 1 went live to registered developers a few hours after the session ended, with a public beta planned for July. The release also includes a revamped Genmoji pipeline, an opt-in on-device memory feature for Apple Intelligence, and the rumored visionOS interface borrowings that bring depth and translucency back to the home screen.
Cook closed the keynote by confirming his earlier-announced September 1 handoff to John Ternus, making this the last WWDC he will headline as CEO. He spent his final five minutes on stage thanking the developer community and previewing a campus event Apple will host on transition day.
Why It Matters
Opening Siri to outside models is a structural shift for the iPhone, and one Apple critics have been demanding since ChatGPT proved consumer LLMs could be useful. It also reshapes the AI competitive map overnight. Anthropic gets direct distribution to roughly 1.4 billion iPhones with no app install required, OpenAI keeps a foothold despite losing default placement, and Google quietly becomes Siri’s underlying engine without owning the surface. For Apple, the Extensions framework lets it stay in the assistant business without betting the brand on any single partner.
The question to watch next is how Apple handles privacy and revenue share across providers, and whether Ternus will keep the multi-model strategy in place or quietly steer Siri back to a single Apple-trained model once it’s ready.