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iOS 27 and macOS Golden Gate have private hooks that let apps add Siri Extensions and replace Siri AI’s server backend with third-party models. First, here’s Claude running as a Siri Extension using the Model Delegation API in App Intents. Claude can appear in Siri’s “Ask…” menu and supports the same underlying flow as the built-in ChatGPT extension. In some cases, Siri Extensions can be more powerful than Siri AI. For example, Siri can’t create a CSV, but Claude can easily return one when asked. When system interaction is required, such as setting a reminder, Claude can relay the original or a modified request back to Siri, which completes the request. Requires the private com\.apple.developer.model-delegation entitlement. (1/2)