Apple Siri Code Reveals Deep Claude, GPT Model Swapping — SkimNews
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- Code researcher "pdfu" discovered private frameworks in iOS 27 and macOS Golden Gate showing Siri's new architecture supports third-party AI models at a deep level, sharing the findings in an X video on September 13, 2026.
- Model Delegation allows Claude to function as a Siri extension identical to the existing ChatGPT extension, interpreting natural language requests and handing system-level tasks back to Siri; Claude was also shown creating a CSV file inside a Siri window — a task Siri alone cannot handle.
- An "Inference Provider" protocol in Model Manager Services lets Apple's server-side Siri model be fully replaced by models like GPT-5.6, which receive Siri's planner prompts and tool definitions, request system actions, and access personal data.
- In the demo, GPT-5.6 within the Siri app found emails on a specific topic, summarized action points, and sent a message via the Messages app, with the response logged in OpenAI's web interface.
- The EU's Digital Markets Act may have shaped Apple's approach, requiring third-party access to iOS features available to Apple's own services, with the European Commission explicitly extending this principle to Siri.
- The "Ask..." implementation is currently limited to the ChatGPT extension in the macOS 27 Golden Gate Release Candidate; model delegation entitlement isn't open to third parties or visible to users yet.
Why it matters: Apple's Siri architecture treats the underlying AI model as swappable, shifting Apple's value to system access permissions, privacy controls, and voice interface rather than the model itself. For users, Claude and ChatGPT could handle tasks Siri can't today; for Apple, it cuts reliance on in-house AI development. The EU's Digital Markets Act appears to be the forcing function.
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