Apple Intelligence Adds Multi-Model 'Extensions' — Users Can Set Claude, ChatGPT, or Gemini as the Default AI Provider

Tom's Guide·high signal

iOS 27 introduces an Extensions system letting users pick a third-party model — Anthropic's Claude, OpenAI's ChatGPT, or Google's Gemini — as the default for Apple Intelligence features like Writing Tools and Image Playground. With Apple's ~2.2 billion active devices, even 5% Claude adoption would exceed Anthropic's entire current user base, making the OS a major new distribution surface. The builder takeaway: model choice is moving to the platform layer, and default-provider selection becomes a real acquisition battleground.