Apple's Siri AI Opens Door to ChatGPT and Claude Integration in iOS 27 Leaked Code

Apple Builds Siri AI With Third-Party AI Models at Its Core

Apple has designed its revamped Siri AI architecture to work seamlessly with third-party AI models, including ChatGPT from OpenAI and Claude from Anthropic, according to leaked code from iOS 27 and macOS Golden Gate discovered by coder pdfu1

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. The leaked private frameworks reveal two distinct integration systems that allow users to either delegate tasks to competing AI models or replace Siri with Claude or ChatGPT entirely as their default on-device assistant3

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. This marks a dramatic departure from Apple's historically closed ecosystem approach, where proprietary software typically dominates hardware integration.

Model Delegation Enables Claude and ChatGPT to Function as Siri Extensions

The first integration method uses a Model Delegation API that lets third-party AI models operate as Siri extensions2

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. In demonstration videos shared by pdfu, users can access the "Search or Ask" bar on Mac and select Claude from the "Ask" menu, then instruct Siri to ask Claude to create reminders in Apple's Reminders app3

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. Siri AI functions as an intermediary in this setup, receiving voice commands or text input from users and routing them to the selected model provider2

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. When tasks require access to proprietary Apple system information or privacy-sensitive features, Siri AI handles the execution after Claude processes and interprets the request1

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Claude can independently complete certain tasks that Siri AI cannot handle, such as creating CSV files after receiving natural language voice prompts2

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. This Extensions Framework provides a dedicated Settings area where users choose their preferred backend model to supply Siri with writing tools and image generation capabilities2

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Model Manager Services Allow Complete Replacement of Siri AI

The second system demonstrates even more extensive AI integration through Model Manager Services, which enables users to completely replace Apple's server-side Siri AI with a different LLM1

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. Pdfu successfully demonstrated GPT-5.6 running with Siri's logged information to execute requests using Siri's interface and voice1

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. In this configuration, ChatGPT receives Apple's Siri planner prompt and tool definitions, enabling it to request system actions, access personal data, and formulate answers that Siri presents through its own GUI or voice3

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The demonstration showed GPT-5.6 searching through emails on the device, locating specific information in the inbox, and using that text to send messages through iMessages1

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. All information typically filtered through Siri AI can be logged in OpenAI's web interface for later access on another platform1

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Digital Markets Act Drives Apple's AI Ecosystem Opening

Apple's decision to allow users to replace Siri with Claude or ChatGPT stems primarily from regulatory pressure rather than voluntary strategic shifts. The European Union's Digital Markets Act specifically mandates that built-in AI chatbots in computing devices must allow users the choice of multiple models2

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. The legislation requires Apple to give third-party developers equal access to iOS hardware and software features available to Apple's own services, with the European Commission explicitly stating this principle extends to Siri AI1

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. The Digital Markets Act specifically targeted Siri AI and Google's Gemini AI, ruling that phone-makers will need to allow third-party AI developers access to on-device software updates to prevent market gatekeeping1

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What This Means for OpenAI, Anthropic, and iPhone Users

This development represents significant opportunity for OpenAI and Anthropic as both companies race to develop more advanced models and prove their worth amid a largely unregulated environment in the United States1

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. With absurdly lucrative IPOs looming for both companies, tapping into the outsized market of American iPhone users could substantially boost their valuations1

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. The "Ask" implementation is currently limited to the ChatGPT extension in the macOS 27 Golden Gate Release Candidate, meaning Claude is not yet available to users3

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. Apple has not yet opened up the model delegation entitlement to third parties and the feature isn't front-facing to users, but the extensive engineering demonstrates Apple's commitment to future model interoperability3

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. Watch for official announcements as iOS 27 and macOS Golden Gate roll out to compatible devices, potentially reshaping how millions interact with AI on their iPhones and Macs.