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After deep digging into iOS 27 and macOS Golden Gate, developer "pdfu" discovered that Apple has designed a new Siri AI architecture within its private frameworks to enable deep collaboration with third-party AI models. Demonstration videos show that models like Claude from Anthropic and GPT-5.6 from OpenAI can be integrated into the Siri framework.
Model Delegation: Claude is integrated as an extension, capable of doing things Siri cannot
One mechanism is called "Model Delegation," allowing Claude to appear as a Siri extension, similar to the currently built-in ChatGPT extension. In the demonstration, macOS users can bring up the "Search or Ask" bar and select Claude as the AI model via the "Ask…" menu.
Once enabled, a user asks Siri to "let Claude" create a reminder in the Reminders app. Claude is responsible for parsing this natural language request, then hands it over to Siri to create the actual event reminder—meaning when the request involves Apple system functions, Claude still returns the task to Siri for execution. In another example, Claude received a request to create a CSV file within the Siri conversation window. Since Siri itself cannot handle such tasks, Claude successfully returned the result, indicating it can help users accomplish what Siri cannot.
Inference Provider: ChatGPT completely takes over Siri's planner
More notably, the second protocol "Model Management Service" includes an Inference Provider, which is more open and allows users to completely replace the on-device Siri model with other models, such as GPT-5.6.
Under this mode, ChatGPT can fully take over Apple's Siri planner and tool definitions, enabling requests for system operations, receiving returned personal data, and generating responses presented by Siri through its own interface and voice. In the demonstration, a user asked ChatGPT to find specific emails in the Siri app, summarize the content and to-do items, then send a message through the Messages app to a contact. The relevant responses were subsequently displayed in the logs on the OpenAI platform's web interface.
Most media believe that the EU's Digital Markets Act may have influenced Apple's decision—this regulation requires Apple to provide third parties with access to iOS hardware and software features equivalent to its own services. The European Commission has clearly stated that this principle applies to the Siri AI.
Currently, the "Ask…" feature is limited to the ChatGPT extension in the macOS 27 Golden Gate candidate release, while Claude is not yet available; Apple has also not opened model delegation authorization to third parties, and this feature is not shown to users. However, the code shows that Apple has made significant engineering preparations for future model interoperability.