Following an in-depth exploration of iOS 27 and macOS Golden Gate, developer pdfu unearthed that Apple has developed a novel AI architecture for Siri within a private framework. This architecture is designed to facilitate seamless, in-depth collaboration with third-party AI systems. Demonstrations reveal that both Anthropic's Claude and OpenAI's GPT-5.6 can be seamlessly integrated. Notably, the "model delegation" mechanism enables Claude to act as an augmentation to Siri, taking on tasks that Siri is unable to handle, while Siri retains responsibility for tasks involving system functions. Furthermore, the "Model Management Service" provides even more extensive flexibility for inference providers, allowing Siri's native model to be entirely replaced with alternatives like GPT-5.6. These substitutes can assume control of Siri's planner and tool definitions, thereby enabling functionalities such as system operations and accessing personal data. The majority of media outlets speculate that the EU's Digital Markets Act may have played a role in influencing Apple's decision to adopt this approach. At present, this feature is only partially accessible in the candidate version of macOS 27, and Apple has yet to grant third-party authorization. However, significant engineering groundwork has already been laid.