Eagle-eyed developers have unearthed, within the test version code of iOS 27 and macOS Golden Gate, that Apple has architected a comprehensive model-switching solution for Siri's AI capabilities. Looking ahead, users will enjoy the autonomy to select from Siri AI and a roster of third-party models, including Claude and ChatGPT. This innovative feature is underpinned by the Model Delegation API within App Intents, which facilitates the direct invocation of third-party models within Siri's established interaction framework. The outcomes of these invocations will be distinctly marked with the source model's identifier, ensuring transparency. In the realm of system operations, once a third-party model comprehends the user's intent, it will seamlessly transfer the task to Siri AI for execution. This setup fosters a clear division of labor: third-party models will concentrate on content comprehension and generation, while Siri AI will handle system-level operations, streamlining the user experience.