Siri AI is reportedly being built to work closely with third-party language models, including OpenAI’s ChatGPT and Anthropic’s Claude, according to code found in a leaked iOS build. The finding suggests Apple’s revamped voice assistant will do more than simply power its own devices, allowing rival systems to operate directly on iPhone and Mac.
Apple has placed considerable emphasis on Siri AI as a central feature of its ecosystem, positioning the updated assistant as a key selling point of the new iPhone 18 Pro at its recent Surprise and Shine event. Yet the company does not appear to be keeping its hardware entirely closed to competitors.
What the Leaked Build Reveals
Private frameworks reportedly discovered in iOS 27 and macOS Golden Gate include Claude models as part of a model delegation feature. This lets Siri users ask Apple’s assistant to hand tasks to another agent. In one demonstration, Siri passed a request to Claude to create an entry in the Reminders app, with Claude acting as the on-device AI and Siri serving as an intermediary. When a request requires access to proprietary Apple system information, Siri handles it instead.
A more extensive app extension was also shown, capable of replacing Apple’s own Siri model entirely with a different large language model. Using a model manager service within the private framework, GPT-5.6 was run alongside Siri’s logged information to carry out requests through Siri’s interface and voice. In the demonstration, the GPT-5.6 model searched through emails on the device, located specific details in the inbox and used that text to send messages via iMessage. Information usually filtered through Siri can be logged in OpenAI’s web interface for later access on another platform.
Regulation Driving the Change
Apple’s apparent willingness to open its ecosystem is closely tied to the European Union’s Digital Markets Act, which requires the company to give third-party developers equal access to its hardware and software features. The legislation has shaped how Apple rolls out new operating system updates.
The rules specifically targeted Siri AI and Google’s Gemini AI, requiring phone makers to grant third-party AI developers access to on-device software updates in future to prevent market gatekeeping. Apple, OpenAI and Anthropic did not immediately respond to requests for comment.
For OpenAI and Anthropic, the developers of ChatGPT and Claude, the development carries significant weight. The two companies are racing to build more advanced models and demonstrate their value to the public in a largely unregulated environment. With substantial IPOs anticipated for both firms in the near future, they are expected to continue seeking access to the large market of American iPhone users.
