Siri AI Will Have Deep Integration With ChatGPT and Claude Models, Leaked Build Shows

Siri AI Integration with Third-Party Models

Siri AI will cooperate with ChatGPT or Claude on certain tasks. The third-party models can even replace Siri altogether.

Apple is putting a lot of effort into making Siri AI the next big thing in its product ecosystem, and its recent Surprise and Shine event made it clear that the revamped voice assistant will be positioned as one of the key selling points of the new iPhone 18 Pro.

But apparently the tech giant isn’t wresting its hardware out of competitors’ hands, according to an X post from pdfu, who routinely leaks upcoming iOS and MacOS code. Instead, according to the post, Apple’s AI will feature deep integration with third-party models, including OpenAI’s ChatGPT and Anthropic’s Claude, with an option to entirely replace Siri with certain GPT models as the on-device agent of choice.

Representatives for Apple, OpenAI and Anthropic didn’t immediately respond to requests for comment.

Leaked Framework and Task Delegation

The latest private frameworks leaked for iOS 27 and MacOS Golden Gate supposedly include Claude models as part of the model delegation feature, where Siri AI users can ask Apple’s model to delegate tasks to another agent.

In a video pdfu posted on X, Siri passes along a request to Claude to create a reminder in the Reminders app. Claude essentially functions as the on-device AI in this video, with Siri working as an intermediary. And if a given request requires access to proprietary Apple system information, it is handled by Siri AI instead.

Full Replacement of Siri AI

Also on display was an even more robust app extension that completely replaces Apple’s own Siri AI model with a different LLM.

Using this model manager service on the private framework, pdfu successfully ran GPT-5.6 with Siri’s logged information to execute requests using Siri UI and voice. The video shows the GPT-5.6 model:

• Searching through emails on the device.
• Locating specific pieces of information in the inbox.
• Using that text to send messages to people in the iMessages app.

All of that information - usually filtered through Siri AI - can be logged in OpenAI’s web interface for later access on another platform.

Regulatory Context

Is Apple breaking down this walled garden of its own volition? Probably not. The European Union’s Digital Markets Act, which requires Apple to give third-party developers equal access to its hardware and software features, has largely shaped how the company rolls out its new operating system updates.

The legislation specifically targeted Siri AI and Google’s Gemini AI, ruling that the phone-makers will need to allow third-party AI developers access to on-device software updates in the future to prevent market gatekeeping.

Although Apple isn’t opening its doors to third-party AI companies out of the goodness of its own heart, this is big news for OpenAI and Anthropic, the developers of ChatGPT and Claude. The two companies are racing to develop more advanced models - and prove their worth to the public - amid a largely unregulated environment. With the promise of absurdly lucrative IPOs for both companies looming in the near future, it’s likely that OpenAI and Anthropic will continue to try to tap into an outsized market of American iPhone users.