Code Reveals You Can Swap Siri AI for Claude or ChatGPT
▼ Summary
– Code sleuth pdfu discovered private frameworks in iOS 27 and macOS Golden Gate revealing deep integration of third-party AI models with Siri.
– The Model Delegation mechanism allows models like Claude to function as Siri extensions, interpreting natural language while handing system tasks back to Siri.
– A second protocol enables Apple’s server-side Siri model to be replaced entirely by external models such as GPT-5.6 via the Inference Providing protocol.
– Demonstrations show these external models can access personal data and perform system actions like sending messages or creating reminders within the Siri interface.
– This architecture may be influenced by the EU’s Digital Markets Act, which mandates third-party access to hardware and software features for services like Siri.
Recent analysis of iOS 19 and macOS 26 private frameworks has revealed that Apple is architecting its next-generation Siri to support a wide array of third-party AI models. This integration appears to operate at a significantly deeper level than previously anticipated, allowing for seamless interoperability between Apple’s interface and external large language models.
The discovery was made by code investigator “pdfu,” who highlighted two distinct mechanisms within the new software builds. The first, termed Model Delegation, enables models like Claude to function as Siri extensions. In demonstrations shared on X, users can select Claude via an “Ask…” contextual menu in the macOS search bar. When tasked with setting a reminder, Claude interprets the natural language request and delegates the actual creation task back to Siri, which then interacts with the Reminders app. This workflow allows the external model to handle complex logic while relying on Siri for system-level actions. Another example showed Claude successfully generating a CSV file, a capability Siri itself lacks, demonstrating its utility for specialized tasks.
A second, more profound protocol involves Model Manager Services. This infrastructure allows Apple to replace its server-side Siri model entirely with a third-party alternative, such as GPT-5.6. In this setup, the external model receives Apple’s native planner prompts and tool definitions. It can execute system actions, access personal data, and formulate responses that are ultimately delivered through Siri’s familiar interface and voice. A tweet from pdfu confirmed this capability:
> And here’s an app extension replacing Siri AI’s server model with GPT-5.6 Terra. It uses the Inference Providing protocol in Model Manager Services. GPT-5.6 receives Apple’s native Siri planner prompt and tool definitions. It can make tool calls that perform system actions, and… pic.twitter.com/cz88kyq3io , pdfu (@itspdfu) September 13, 2026
In one test case, a user asked the ChatGPT model to find emails on a specific topic, summarize them, and send a message via the Messages app. The entire process was logged on OpenAI’s platform, confirming that the external model handled the planning and execution logic before returning the result to Siri.
This architectural shift may be influenced by regulatory pressures, particularly the European Union’s Digital Markets Act. This legislation mandates that Apple provide third parties with effective access to iOS hardware and software features, a requirement the European Commission has explicitly stated applies to Siri. By opening these deep integration points, Apple may be preparing to comply with these regulations while offering users greater flexibility in their AI choices.
Currently, the “Ask…” feature is restricted to the ChatGPT extension in the macOS 26 Golden Gate Release Candidate. Claude is not yet available, and Apple has not publicly released the model delegation entitlements to developers. Nevertheless, these internal codes signal a significant strategic pivot toward a more open, modular AI ecosystem for Apple devices.
(Source: MacRumors)
