TREE NEWS update: A developer posting as pdfu on X said iOS 27 and macOS 27 contain an undocumented interface letting third-party apps plug into “Siri extensions” or replace the server-side model behind Siri’s AI. In demonstrations using Claude and GPT-5.6 Terra, the latter received Apple’s native prompts and tool definitions, executed system actions and accessed personal data. Both rely on private entitlements, and Apple has recently tightened the related settings.
Developer Says iOS 27 Has Private API Allowing Third-Party Models to Replace Siri Backend
AI take
The significance lies less in the demos than in the mechanism: private entitlements mean this is not an open platform feature but a capability Apple can enable, gate, or revoke at will, and the recent tightening of related settings suggests the company is already moving in that direction. The parties most affected are third-party model providers and developers who might build against an interface with no public commitment behind it. Whether Apple formalizes any of this or shuts it down is the open question, and the demonstrations themselves are not evidence of shipping intent.
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