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Siri's New Trick: Let Claude or ChatGPT Take the Wheel

Apple's Siri Might Soon Call for Backup

Imagine asking Siri to create a CSV file, and it actually works. That's the future hinted at by developer "pdfu," who dug into iOS 27 and macOS Golden Gate. Inside Apple's private frameworks, they found a new Siri AI architecture built for third-party AI models. Demonstration videos show Anthropic's Claude and OpenAI's GPT-5.6 plugging right into Siri.

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Two Ways to Hand Over the Reins

The first mechanism, Model Delegation, lets Claude appear as a Siri extension—similar to the ChatGPT extension already in macOS. In the demo, a user opens the "Search or Ask" bar, picks Claude from the "Ask…" menu, and then asks Siri to "let Claude" set a reminder. Claude parses the natural language, but Siri still creates the actual reminder. That's the key: when Apple's system functions are involved, Claude passes the task back to Siri. But when the request is something Siri can't do—like generating a CSV file—Claude handles it and returns the result. So you get the best of both worlds: Siri's system integration plus Claude's extra skills.

ChatGPT Doesn't Just Help—It Takes Over

The second protocol, Model Management Service, goes further. It includes an "Inference Provider" that lets users completely swap out the on-device Siri model for another one, like GPT-5.6. In this mode, ChatGPT fully takes over Apple's Siri planner and tool definitions. It can request system operations, receive personal data back, and generate responses that Siri presents through its own interface and voice.

In one demo, a user asked ChatGPT to find specific emails in the Siri app, summarize the content and to-do items, then send a message to a contact via Messages. The responses showed up in OpenAI's platform logs. That's a big deal—it means ChatGPT isn't just a helper; it's running the show.

Why Is Apple Doing This? Blame the EU

Most media point to the EU's Digital Markets Act. This regulation requires Apple to give third parties access to iOS hardware and software features on par with its own services. The European Commission has made it clear: this applies to Siri AI too. So Apple might be preparing for a future where it has no choice but to open up.

What's Available Right Now? Not Much

Don't get too excited yet. In the macOS 27 Golden Gate candidate release, the "Ask…" feature only supports the ChatGPT extension. Claude isn't there. Apple hasn't opened model delegation authorization to third parties, and users can't see this feature. But the code tells a story: Apple has done serious engineering groundwork for model interoperability. It's not a matter of if, but when.

Key Points

  • Developer "pdfu" found code in iOS 27 and macOS Golden Gate that enables third-party AI models like Claude and GPT-5.6 to integrate with Siri.
  • Model Delegation lets Claude act as a Siri extension, handling tasks Siri can't while passing system-related requests back to Siri.
  • Model Management Service with an Inference Provider allows ChatGPT to fully replace Siri's planner, taking over system operations and responses.
  • The EU's Digital Markets Act likely pushed Apple toward this openness, as it mandates third-party access to iOS features.
  • Currently, only the ChatGPT extension is available in the macOS 27 candidate release; Claude and full model delegation are not yet public.