Apple's Siri AI to Support Deep ChatGPT and Claude Integration, Leaked iOS 27 Code Reveals

Apple Opens Siri AI to Third-Party Models

Apple is preparing to transform Siri AI from a closed system into a platform that supports deep integration with third-party AI models, according to leaked code from iOS 27 and macOS Golden Gate discovered by code sleuth "pdfu."1

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The private frameworks reveal that users will soon be able to delegate tasks to ChatGPT and Claude, or even replace Siri entirely with alternative LLM options.

The leaked build demonstrates two distinct integration methods. The first, called Model Delegation, allows Claude to function as a Siri extension similar to the existing ChatGPT integration. In demonstration videos, users can ask Siri to "Ask Claude" to perform tasks like setting reminders in Apple's Reminders app.2

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Claude interprets the natural language request, and Siri executes the system-level action. When requests require access to proprietary Apple system information, Siri handles those components directly while Claude manages the interpretation layer.

Complete Model Replacement Through Model Manager Services

The second protocol goes considerably further. An inference provider within Model Manager Services enables users to completely replace Apple's server-side Siri AI model with alternatives like GPT-5.6.1

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In this configuration, the replacement model receives Siri's planner prompt and tool definitions, allowing it to request system actions, access personal data, and formulate responses that Siri presents through its interface and voice.

Demonstration footage shows GPT-5.6 searching through emails on the device, locating specific information in the inbox, and using that data to send messages through iMessages—all while maintaining access to Siri's logged information.1

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This information can then be accessed through OpenAI's web interface on other platforms, representing a fundamental shift in how Apple manages user data within its AI ecosystem.

Digital Markets Act Drives Interoperability

Apple's move toward AI model interoperability appears driven by regulatory pressure rather than voluntary openness. The European Union's Digital Markets Act requires Apple to provide third-party developers equal access to its hardware and software features.1

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The legislation specifically targeted Siri AI and Google's Gemini AI, mandating that phone manufacturers allow third-party AI developers access to on-device software features to prevent market gatekeeping.1

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The European Commission has explicitly stated that this principle of effective access extends to Siri, shaping how Apple engineers its operating system updates.2

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While Apple hasn't opened the model delegation entitlement to third parties yet and it remains hidden from user-facing interfaces, the extensive engineering work demonstrates the company's commitment to future model compatibility.

Strategic Implications for OpenAI and Anthropic

This development represents significant opportunity for OpenAI and Anthropic as they race to develop more advanced AI models and demonstrate value to the public. With lucrative IPOs looming for both companies, gaining access to Apple's massive user base—particularly American iPhone users—could prove transformative.1

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The macOS 27 Golden Gate Release Candidate currently limits the "Ask..." implementation to the ChatGPT extension, meaning Claude is not yet available in the shipping version.2

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However, the underlying architecture clearly supports broader integration, suggesting Apple is building infrastructure for a more open AI landscape across its devices. Watch for official announcements as iOS 27 and macOS Golden Gate roll out, and monitor how quickly third-party developers gain access to these powerful integration capabilities.