Apple Intelligence now lets you set Claude, ChatGPT, or Gemini as the default provider.

iOS 27 introduces an Extensions system letting users pick a third-party model for Writing Tools, Image Playground, and other features. With Apple's ~2.2 billion active devices, even 5% Claude adoption would exceed Anthropic's entire current user base. Model choice is moving to the platform layer, and default-provider selection becomes a real acquisition battleground. This is the single biggest distribution shift in the list, the OS itself is now a model-selection surface.