Apple's Siri AI Can Be Swapped Out for Claude, ChatGPT, Code Shows - MacRumors

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One mechanism called Model Delegation allows Claude to appear as a Siri extension in the same way as the existing built-in ChatGPT extension. In pdf's video, shared on X, the macOS user brings up the "Search or Ask" bar and chooses Claude as the AI model via an "Ask..." contextual menu.
After enabling the Claude extension, the user asks Siri to "Ask Claude" to set a reminder in Apple's Reminders app. Claude then interprets the natural language reminder request and Siri subsequently creates the reminder. The implication is that if the request requires access to an Apple system feature, Claude hands the task back to Siri.
In another example, Claude can be seen in a Siri app conversation window receiving a request to create a CSV file – something Siri itself cannot handle – and successfully returning the result.
What's more intriguing is the second protocol demonstrated in the video that appears to go considerably further, and could really open up the AI landscape for Apple software requests.
An inference provider in "Model Manager Services" apparently allows Apple's own server-side Siri model to be completely replaced by another model, such as GPT-5.6. In this scenario, ChatGPT receives Apple's Siri planner prompt and tool definitions, which enables it to request system actions, receive the resulting personal data, and formulate an answer that Siri presents using its own interface and voice.

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 the demonstration video, the user asks the ChatGPT model (within the Siri app) to find emails about a specific topic, summarize their contents and action points, then send an message to a person in the user's contacts via the Messages app. The response is then shown as logged in OpenAI's platform web interface.
The European Union's Digital Markets Act may have helped shape Apple's approach here, as it requires Apple to give third parties effective access to iOS hardware and software features available to Apple's own services, and the European Commission has specifically said this principle extends to Siri.
The "Ask..." implementation is currently limited to the ChatGPT extension in the macOS 27 Golden Gate Release Candidate (which is effectively the final version of the software set to be released later today), so Claude is not yet available. Meanwhile, Apple has not yet opened up the model delegation entitlement to third parties and it isn't front-facing to users, but it at least shows how extensively Apple has engineered Siri for future model interoperability.
Related Roundups: iOS 27, iPadOS 27, macOS Golden GateTags: ChatGPT, Claude, Siri Guide, Siri AIRelated Forums: iOS 27, macOS Golden Gate[ 35 comments ]Get weekly top MacRumors stories in your inbox.Leave this field emptyPopular StoriesiOS 27 Introduces New 'iPhone Handoff' FeatureWednesday September 2, 2026 12:35 pm PDT by Joe RossignolApple has added a new "iPhone Handoff" feature to iOS 27 that will allow you to switch between two iPhones while using the same phone number on each device.
This functionality was briefly mentioned during the WWDC 2026 keynote in June, on a slide that listed hundreds of new features coming in iOS 27 and corresponding software updates, but Apple never shared any further details at the time.

...Read Full Article • 168 commentsHere's When iOS 27 Rolls Out Today in Every Time ZoneSunday September 13, 2026 3:00 am PDT by Eric SlivkaApple is about to release iOS 27, which will finally deliver more advanced Siri AI capabilities as well as a variety of other refinements, improvements, and new features to iPhones. It's Apple's biggest software update of the year, and Apple announced at Wednesday's iPhone event that it will be releasing iOS 27 sometime today – Monday, September 14.
iOS 27 won't be the only release today,...Read Full Article • 105 commentsApple Announces iOS 27 Release DateWednesday September 9, 2026 10:46 am PDT by Joe RossignolAt its event today unveiling the iPhone 18 Pro, AirPods 5, Apple Watch Series 12, and more, Apple announced that iOS 27 will be released later this month.
iOS 27 has already been available as a developer beta since June and as a public beta since July, and Apple today said that the update will be released for all users with a compatible iPhone model on Monday, September 14.
iOS 27 is...Read Full Article • 40 commentsTop Rated CommentsUunobtainium1 hour ago at 04:41 amAs it should be. The “walled garden” approach no longer holds when so much of our daily work and lives exists on the device. People should be able to choose which services they trust and find most useful. Thanks EU!Score: 12 Votes (Like | Disagree)QuarterSwede50 minutes ago at 05:17 amyou are being very politeAfter 15 years, Siri is still as dumb as day 1That’s not remotely true. Siri AI is a big improvement. It’s conversationally and contextually aware which makes it a lot more useful and what people generally want when asking it questions.While playing Dogs by Pink Floyd, I asked it, “who’s playing the guitar?” It answered correctly in about 3 seconds.Could old Siri have done that? Absolutely not.Here’s the actual question in the Siri app where it gave an even more detailed answer. This is from my original question, I didn’t ask it again.Score: 4 Votes (Like | Disagree)klasma1 hour ago at 04:48 amSiri AINow that’s an oxymoron if I’ve ever heard oneAspirational IntelligenceScore: 4 Votes (Like | Disagree)Ttivoboy1 hour ago at 04:48 amSo in their presentation, when they said “all the compute with YOUR data is done on your device, and via the Siri AI Secure Enclave”They meant, “when using the SIRI AI prompt”Score: 4 Votes (Like | Disagree)AAlloween1 hour ago at 04:43 amFor me this is good news! Because less reasons for EU to complain.Score: 4 Votes (Like | Disagree)vegetassj41 hour ago at 04:41 amSiri AINow that’s an oxymoron if I’ve ever heard oneScore: 4 Votes (Like | Disagree)Read All CommentsNext ArticleThird-Gen iPhone Duo to Get Face ID, Telephoto Lens, Expects GurmanVideosplayiPhone 18 Pro Hands-On: What Upgrades Actually Matter?Apple Surprise and Shine Recap: iPhone Duo, iPhone 18 Pro & More! | Episode 210iPhone Duo Hands-On: I’m VERY ImpressedApple’s HUGE September Event Recap: Everything Announced (iPhone Duo, 18 Pro, and More)Apple September 9th iPhone Event: EVERYTHING We’re Expecting!See more videosGuidesiOS 26 Features Our comprehensive guide highlighting every major new addition in iOS 26, plus how-tos that walk you through using the new features.iOS 26.6 Features Dozens of security fixes, plus Spotlight optimizations for upcoming iOS 27 release.50 macOS Tahoe Features New features and lesser-known changes to check out if you're upgrading.iPhone 17 vs iPhone 17 Pro vs iPhone Air Apple's four new iPhones feature more differences between the latest models than ever before, so which one should you buy?• Apple Intelligence Guide • iPhone Mirroring Not Working? • 21 Time-Saving iPhone Tips • 14 macOS Tips to Make Your Life Easier • Image Playground Guide • One AirPod Not Working? 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Code sleuth pdfu has revealed that Apple has engineered its new Siri architecture to support integration with third-party AI models at a deep level, utilizing mechanisms that enable the swapping of Siri's underlying AI for models like Claude or ChatGPT. One mechanism described is Model Delegation, which functions similarly to existing ChatGPT extensions, allowing models like Claude to operate as Siri extensions. This capability is demonstrated by allowing users to invoke Claude through a contextual menu, such as the "Search or Ask" bar, where Claude can interpret natural language requests and delegate system actions back to Siri, such as setting a reminder in the Apple Reminders app. Furthermore, Claude has shown the ability to handle tasks beyond Siri's native capabilities, such as generating a CSV file, by effectively interfacing with system functions.

A more profound capability demonstrated involves a second protocol within Model Manager Services, which facilitates the replacement of Apple's internal server-side Siri model with external models, such as GPT-5.6. In this advanced scenario, the external model receives Apple's native Siri planner prompts and tool definitions. This allows the third-party model to initiate system actions, retrieve necessary personal data, and formulate a response that is ultimately presented using Siri's established interface and voice. For instance, a demonstration showed the ChatGPT model accessing prompts and tool definitions to find emails, summarize content, and initiate a message via the Messages app, with the final output being delivered through the Siri interface.

This architecture reflects Apple's efforts toward future model interoperability. The demonstration suggests that the system is designed to allow external AI to manage and execute system-level requests through Siri. This approach is framed within the context of regulatory considerations, as the European Union’s Digital Markets Act influences Apple's approach by mandating effective access for third parties to iOS hardware and software features. Although the "Ask..." implementation is presently limited to the ChatGPT extension in the macOS 27 Golden Gate Release Candidate, Apple has engineered the system for this level of integration. Despite this comprehensive engineering, the entitlement for third parties to access model delegation is not yet front-facing to users.