Only 3 iPhones can access the best version of Siri AI — here’s which features are exclusive to Apple’s ‘most powerful on-device model’, AFM Core Advanced, and whether you should care about them
Publish Date: 2026-06-10 08:34:00
Source Domain: www.techradar.com
I was in charge of live-blogging WWDC 2026 earlier this week, and keeping up with Apple’s device requirements for iOS 27, Apple Intelligence, and Siri AI felt like a job for someone with a photographic memory.
All three software packages have different entry criteria (and that’s to say nothing of iPadOS 27 and macOS Golden Gate), so after the show, I published an iOS 27 and Siri AI compatibility explainer, which will tell you whether your iPhone can support Apple’s upcoming iOS features.
I’m not going to repeat all those device requirements here, but a big point of confusion has been the exclusivity of Apple’s “most powerful on-device model”, known officially as Apple Foundation Models (AFM) Core Advanced. Only three iPhones — the iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air — have enough RAM (12GB) to access this model and, therefore, the very best version of Siri AI. But what does that mean, exactly?
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The device requirements of AFM Core Advanced (Image credit: Apple)
According to Apple’s press release on Siri AI, the two features exclusive to AFM Core Advanced are voice customization and more advanced systemwide dictation.
The former gives you the ability to customize the expressiveness and pace of Siri’s voice — anyone with access to Siri AI can still choose from a set number of Siri voices, but you’ll need an iPhone 17 Pro, iPhone 17 Pro Max, and iPhone Air to make Siri speak faster, slower, and with more or less enthusiasm.
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(Image credit: Apple / Future)
The second feature — more advanced systemwide dictation — is arguably the more significant. It essentially means those top-end iPhones are more effective at converting speech into accurate text than older or less advanced iPhones. This updated dictation engine “automatically handles capitalization, punctuation, and formatting as [you] speak,” Apple says, meaning you can “speak naturally and trust that…
