Apple drew a new line inside Apple Intelligence at WWDC 2026, and it's a line that didn't exist a week ago. The company's most powerful on-device AI model in iOS 27 requires 12GB of unified memory. The base iPhone 17 ships with 8GB. Two Siri features, expressive voices and advanced dictation, are now locked behind that 4GB gap.
This isn't a case of old hardware losing support. The iPhone 17 is a current-generation device. The iPhone 16 Pro, last year's flagship marketed heavily around Apple Intelligence, also falls short. For the first time since Apple Intelligence launched with an 8GB baseline, "supports Apple Intelligence" and "supports Apple's most advanced on-device model" mean two different things.
What the 12GB model actually does
Apple's official footnote is specific. The advanced on-device model enables two named capabilities: expressive Siri voices and more advanced systemwide dictation. Expressive voices let users customize Siri's tone and pacing, moving away from the flat synthesized delivery that's defined the assistant since 2011. Advanced dictation captures speech as formatted text in real time, handling capitalization, punctuation, and paragraph breaks as the user talks.
