# iOS 27 Ships Today — Apple Hid a Siri AI Swap in the Code > Source: > Published: 2026-09-14 18:09:17+00:00 iOS 27 shipped to devices worldwide today. Most of the coverage is about the rebuilt Siri app interface and the 250+ OS changes Apple announced. What’s getting far less attention: buried inside the release candidate code are two undocumented mechanisms that let third-party AI models — Claude, ChatGPT, others — replace Siri’s AI backend entirely. Apple has not announced this. No developer entitlement is open yet. But the infrastructure is fully built, [ChatGPT already works in macOS 27’s “Ask…” menu today](https://9to5mac.com/2026/09/14/ios-27-code-shows-you-may-be-able-to-replace-siri-ai-with-claude-or-chatgpt-poll/), and the entitlement lives inside App Intents — the same public framework your app already uses. ## Two Mechanisms, Two Levels of Depth Researcher @itspdfu surfaced two distinct integration points in the iOS 27 and macOS Golden Gate code on the same day Apple pushed the final release. The first is **Model Delegation**, which operates at the Siri Extension level. An app registers via the `com.apple.developer.model-delegation` entitlement inside App Intents, and the model appears in Siri’s “Ask…” contextual menu alongside the built-in options. The user invokes it (“Ask Claude”), the third-party model handles natural language interpretation, and when a system action is needed — creating a reminder, sending a message — the model hands the request back to Siri to execute. Claude can read and respond; Siri retains control over the actual device action. The second is the **Inference Provider Protocol**, which is something else entirely. This lives in Model Manager Services and performs a full replacement of Apple’s server-side Siri planner. Under this protocol, the external model receives Siri’s actual planner prompt, its full tool definitions, and access to personal data. It returns results that Siri presents in its own UI and voice. The demonstration used GPT-5.6 Terra to find emails on a topic, summarize them, identify action items, and draft a Messages reply — with the full session logged inside OpenAI’s platform. That is not an extension; that is Siri with a different brain. ## What Is Actually Available Today It is worth being precise here, because this story is circulating with some confusion. | Mechanism | Integration Level | Status Today | |---|---|---| | Model Delegation API | Siri Extension (ask-and-relay) | macOS 27: ChatGPT only. iOS 27: not live. Entitlement not open to developers. | | Inference Provider Protocol | Full Siri planner replacement | Not user-facing on any platform. Demonstrated internally only. | On macOS 27, “Ask ChatGPT” is live and user-facing. Claude is not available as a user-facing option — it was demonstrated working in private tests by enabling the entitlement through unofficial means, but it does not appear in production. On iOS 27, neither mechanism is user-facing. The entitlement `com.apple.developer.model-delegation` exists in the App Intents framework but is not in the developer portal, and Apple has published no documentation for either mechanism. ## The EU Situation Is More Complicated Than Reported Several outlets have suggested Model Delegation is a DMA compliance play that will ship EU-first. That framing gets the situation backwards. Apple has actually [blocked Siri AI entirely from EU iPhones, iPads, and Watches](https://www.apple.com/newsroom/2026/06/due-to-dma-siri-ai-delayed-in-eu-for-ios-27-and-ipados-27/) with iOS 27. Under the European Commission’s interpretation of the DMA, once Siri AI launches, Apple must give any competing AI assistant nearly unlimited device access — the ability to read messages, make purchases, execute cross-app actions — without the safeguards Apple considers necessary. Apple proposed an 18-month exemption. The Commission rejected it. Siri AI launches on macOS 27 and visionOS 27 in the EU, but not on iPhone or iPad. The Model Delegation code is not a solution to this dispute. It is a separate piece of infrastructure, and its path to release runs through the normal developer entitlement process — not DMA negotiations. ## Three Signals That Tell You When It’s Real Based on Apple’s pattern with similar staged rollouts, three conditions need to be true before developer access is meaningful: 1. An Apple developer session or announcement — WWDC27 or a dedicated event covering Model Delegation 2. Public App Intents documentation for the `com.apple.developer.model-delegation` entitlement 3. The entitlement appearing in developer account portals Realistically, this lands in a major iOS 27.x point release or at WWDC27 in June 2027. Apple moved quickly on the ChatGPT integration once the OpenAI deal was structured, and the plumbing for Claude is demonstrably built. [The timeline is not years away.](https://ai-tldr.dev/releases/apple-siri-model-delegation/) ## What to Build Right Now The entitlement is not open, but the preparation work is well-defined. App Intents 2.0 ships with iOS 27 today and is worth implementing regardless of Model Delegation. Multi-turn conversational follow-ups, streaming responses for long-running tasks, and the View Annotations API are all live now and will make your app a better Siri citizen immediately. If your app has core actions users would want to invoke by voice, add SiriKit intents for them. These are the natural hook points for Model Delegation: when a third-party model needs to execute a system action, it relays the request back to Siri, which calls the registered intent. If you are wrapping or distributing an AI model, conform to Apple’s LanguageModel protocol. That is already generally available, documented at [WWDC26 session 339](https://developer.apple.com/wwdc26/339), and positions your model for both the Foundation Models framework and future Siri integration. When the Model Delegation entitlement drops, speed will matter. Apps that have already built good App Intents coverage will integrate in days. The apps that haven’t will spend that time catching up while others own the “Ask…” surface.