iOS 27 code hides hooks that let rival AI models plug into Siri
On September 13, 2026, researcher @itspdfu shared findings from private frameworks in iOS 27 and macOS, which MacRumors reported on September 14. One mechanism, Model Delegation, lets a third-party AI appear as a Siri extension, so a user could ask Claude to set a reminder and Siri would create it. A second lets an outside inference provider replace Apple's server-side Siri model, receiving Siri's planning prompt and tools; in the researcher's demo, that replacement ran on OpenAI's GPT-5.6. Apple hasn't opened either mechanism to outside developers, and Claude isn't available to users.