Which AI on your iPhone & Mac — choosing your Apple Intelligence model.
For two years, "the AI on your iPhone" meant whatever Apple bundled. That's changing. With iOS 27, Apple opens Siri, Writing Tools, and Image Playground to outside AI — you'll pick ChatGPT, Claude, Gemini, or Grok yourself. Most people will tap "OK" on the default and never think about it again. You're not most people. Here's what changed, how to set it, and which AI to choose for which job.
What changed
Apple stopped picking your AI for you.
At its June 2026 developer conference, Apple introduced iOS 27 "Extensions" — a framework that lets third-party AI models plug into the core Apple Intelligence features: Siri, Writing Tools, and Image Playground. Instead of one built-in assistant, there's now an App Store marketplace of AI providers, and you choose which one powers what. It ships to the public in September 2026 with iOS 27, iPadOS 27, and macOS 27 (on iPhone 15 Pro, iPhone 16, and later).
Out of the box, Apple's default runs on a Gemini-based model (the result of an Apple–Google deal). But you can swap that for ChatGPT, Claude, Gemini, or Grok — and you can even assign different models to different tasks.
This is the "which AI for which job" idea arriving on the device you already carry everywhere. The phone stops being locked to one company's AI and becomes a place where you bring the right tool to the right task — exactly how power users already work on the desktop.
How to set it
Two minutes in Settings.
Once you're on iOS 27 (or iPadOS/macOS 27):
- Open Settings → Apple Intelligence & Siri.
- Find the AI model / extensions section and pick your preferred provider. You may need to install that provider's free app/extension from the App Store first and sign in.
- If your device offers per-task choices, set them — e.g., one model for writing, another for images (more on that below).
This is brand-new (announced June, shipping September 2026). Exact menu names and which providers are available may shift between the betas and the final release — and by region. Treat the steps above as the shape of it; the final labels may differ slightly. We'll keep this lesson current as it ships.
Which model for which job
The whole point of the change is choice — so use it. Here's the honest match for the three places Apple Intelligence shows up:
If you only want to make one choice and move on: the Gemini-based default is genuinely fine for most people. The upgrade is being able to change it when a task deserves a better tool.
The privacy question
The most important thing to understand: when Siri or Writing Tools hands a request to a third-party model, that content leaves your device and goes to that company (OpenAI, Anthropic, Google, or xAI) to be processed under their terms — not Apple's on-device privacy. Apple typically asks for permission before sending, and some simple requests stay on-device, but the moment you route to an outside model, you're playing by that model's data rules.
Before you let Siri send something to an external AI, ask the same question we teach everywhere: "Would I be comfortable typing this into that company's chatbot?" Drafting a dinner invite — sure. Dictating something private, medical, or confidential — keep it on-device or skip the AI. Convenience shouldn't switch your privacy brain off.
The honest take
This is a genuinely good change — competition on your phone instead of a single locked-in assistant. But two grounding truths keep you from over-rotating on it:
- The default is fine for most tasks. You don't need to obsess over the setting. Change it deliberately when a specific job (careful writing, images, current events) deserves a specific tool.
- The on-device assistant is not your power tool. Siri-with-a-better-brain is great for quick, hands-free moments. Real work — deep research, long documents, building things — still belongs in the full apps, where the same models are far more capable. The phone is the convenience layer, not the workshop.
Before you commit a model to your phone, feel the differences first. Run one writing prompt — "rewrite this text to sound warm and professional: [paste a rough message]" — across ChatGPT, Claude, and Gemini side by side. The one whose voice you like best is the one to set for Writing Tools.
Open Playground →Final challenge: set your phone up on purpose
When iOS 27 lands (or now, if you're on the beta): go into Settings → Apple Intelligence & Siri and make three deliberate choices — your writing model, your image model, and whether you're comfortable with Siri sending requests off-device at all. Then use it for a week and notice where the on-device AI helps and where you still reach for a full app. That line — convenience vs. workshop — is the real lesson.
What you can do now
- Understand that iOS 27 lets you choose ChatGPT, Claude, Gemini, or Grok for Apple Intelligence
- Set your preferred model in Settings → Apple Intelligence & Siri
- Match the model to the task: Claude for writing, a strong image provider for Image Playground, Grok for current events
- Run the one-question privacy test before letting Siri send anything off-device
- Keep real work in the full apps — the phone is the convenience layer