Take from this what you will.
Techradar reporting that potentially only the 15 Pro & Pro Max with the more powerful A17 Pro chip will get full on device AI features (obviously the 16 series debuting with iOS 18) Even the A16 devices, 15 & 14 Pro series may have restrictions.
“Bloomberg's Mark Gurman suggested in his latest Power On newsletter that iOS 18's new AI features – which could include a more natural Siri and voice memo transcriptions – may be restricted to the iPhone 15 Pro and Pro Max, plus the new iPhone 16 and 16 Pro series.
Referring to the new AI features, Gurman stated that "most of the on-device features will be supported by iPhone, iPad and Mac chips released in the last year or so." For the iPhone, that would mean the A17 Pro, which landed in September 2023, but probably excludes the A16 Bionic, which arrived in September 2022”
Arcticle here -
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iOS 18's AI features could be exclusive to recent iPhones, but don't worry about upgrading just yet
AI promises could take a while to reach fruitionwww.techradar.com
Sounds about right. A17 Pro, A17, and M3. Maybe limited features on M2 since iPad Air just came out with it.
Apple's goal is to sell new iPhones and iPads, not give away new features to old devices.