iOS 27 code hides hooks that let rival AI models plug into Siri

Code in iOS 27 suggests Apple built its new Siri to work with AI that Apple did not make. The mechanisms exist, but they are private, and Apple has not opened them.

What the researcher found

On September 13, 2026, researcher @itspdfu shared findings from private frameworks in iOS 27 and macOS, which MacRumors reported on September 14.

The first mechanism, Model Delegation, lets a third-party AI appear as a Siri extension, the way ChatGPT already does. A user could ask Claude to set a reminder, and Siri would create it.

The second goes further. It lets an outside inference provider replace Apple’s server-side Siri model, receiving Siri’s own 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.

Why Apple might have built it

Apple released iOS 27 on September 14, with its rebuilt Siri rolling out in beta. MacRumors points out that the EU’s Digital Markets Act requires Apple to give rivals access to features its own services use, which may explain why the hooks exist.

What to watch

Private code is not a product announcement. Apple has not announced either feature, and it could leave them unused or remove them in a later update. If Apple does open them, though, the model behind a phone’s assistant could become a user choice rather than a default, and the competition among AI companies would move one layer closer to the operating system.