On September 13, 2026, developer pdfu demonstrated Claude running as a Siri extension on macOS Golden Gate through Apple’s private Model Delegation API. The setup shows a striking technical possibility: Claude can handle generative work while Siri remains responsible for native system actions. It is not a public setting that lets ordinary users replace Siri with Claude.
The distinction matters because Apple introduced Siri AI for developer testing on June 8, 2026, but its official architecture centers on Apple Foundation Models and Private Cloud Compute. The Claude demonstration is a separate, private-API experiment.
Claude handles generation while Siri keeps system actions
The reported setup divides the assistant’s work rather than handing every Siri function to Claude. Claude can handle a generative task such as creating a CSV file. When the request requires a native system action—setting a reminder, for example—Siri keeps control of that operation.
The Model Delegation API is not a public switch
The implementation uses the Model Delegation API, a private interface inside Apple’s App Intents framework. The reported demonstration also requires a private Apple entitlement—authorization normally reserved for Apple’s own uses rather than a general developer option.
That technical detail changes the answer to a very common question: can you change Siri to Claude? Not through a normal iPhone or Mac setting. The demonstration shows what an authorized private integration can do; it does not provide a supported installation path for users or a public developer API.
The working demonstration described by pdfu ran on macOS Golden Gate. iOS 27 is associated with comparable private hooks, but the Mac demonstration should not be presented as a public iPhone feature.
Privacy and support trade-offs
Apple describes Private Cloud Compute as part of Siri AI’s architecture. The reported Claude route raises a different privacy consideration: requests sent to Claude may leave Apple’s Private Cloud Compute environment and reach Anthropic’s servers.
Private APIs and their entitlements can change between system versions, so this implementation has no guarantee of continued support.
