iOS 27 and macOS 27 reportedly contain undisclosed interfaces that allow third-party apps to connect to “Siri extensions” or replace the server-side model powering Siri AI, developer pdfu said in a post on X on Sept. 13.
Demonstrations using Claude and GPT-5.6 Terra showed the server-side model receiving Apple’s native prompts and tool definitions, performing system operations, and accessing personal data. Both demonstrations relied on private permissions, which Apple has recently tightened.
iOS 27 Reportedly Exposes Private APIs for Replacing Siri’s Backend Model
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