Apple will let users pick any AI model for Apple Intelligence in iOS 27

Apple is preparing to give users full control over AI in its ecosystem. In iOS 27, iPadOS 27 and macOS 27, users will be able to pick any third-party AI model for Apple Intelligence instead of the built-in tools.

Apple's Extensions system

The new architecture will be called Extensions. Compatible AI models will work not only in Siri but across all Apple Intelligence tools, including Writing Tools (text rewriting) and Image Playground (image generation). The system will let users literally swap the brain of Apple Intelligence for ChatGPT, Claude, Gemini or any other agent.

Until now, Apple Intelligence was locked within its own boundaries: you used the built-in models because there was simply no alternative. Now the company is opening the system to competition. It resembles how smartphones let users pick a browser: formally the choice existed, but until recently Safari was hard-wired into the system.

Each extension will run within the Apple ecosystem, but using the third party's own API and data processing. Apple guarantees compatibility, but competing AI agents may differ in speed, accuracy and how they handle data.

A Siri voice for each model

Apple will add one more feature: different Siri voices for different AI models. If you switch to ChatGPT, replies will be read aloud in the voice you selected for it. With Claude, in its own voice. This helps users tell at a glance which agent is listening, and makes the experience more personal.

The feature is especially useful for professionals who use different AI tools for different tasks. Instead of opening separate apps, they can stay inside the Apple ecosystem and simply change the model as needed.

What changes for users

This architecture removes the main limitation of Apple's closed ecosystem: its monopoly on AI. Users will be able to:

• Pick the best AI model for each task (Claude for code, ChatGPT for creative writing)
• Change models directly in system tools, without opening separate apps
• Keep context and request history in Apple's systems
• Assign different Siri voices to different models for convenience

What it means

Apple is essentially building a marketplace of AI models right into the OS. Users get a choice, and AI service developers get access to billions of iPhones. For the ecosystem this is a huge shift: Apple used to hold everything in its own hands, and now competition opens up inside the system itself.

It may mark the start of a new era in mobile operating systems, one where AI is no longer a service but a choice.