iOS 27 Code Analysis Reveals Siri Designed to Integrate with Third-Party Models Like Claude and ChatGPT

Code analyst 'pdfu' analyzed the private frameworks of iOS 27 and macOS Golden Gate, confirming that Apple's new Siri architecture is designed to integrate with third-party AI models at a deep level.

Through the Model Delegation mechanism, Claude can appear as a Siri extension in the same way as the existing built-in ChatGPT extension. Users can select Claude via the 'Ask...' context menu in the 'Search or Ask' bar on macOS. When integrating with system features such as setting reminders, Claude interprets natural language requests while Siri performs the actual tasks.

By configuring the inference provider in Model Manager Services, it is also possible to completely replace Apple's server-side Siri model with other models such as GPT-5.6. In this case, ChatGPT receives Apple's Siri planner prompt and tool definitions to handle system task requests and personal data, generating responses through the Siri interface.

Currently, this feature is limited to the ChatGPT extension in the macOS 27 Golden Gate Release Candidate, and Apple has not yet opened model delegation permissions to third parties. However, the EU's Digital Markets Act (DMA) may have influenced Apple's approach, suggesting that Apple has extensively engineered Siri for future model interoperability.