Apple has introduced a new tier of on-device AI in iOS 27, requiring 12GB of unified memory—locking the base iPhone 17 out of the most advanced Siri features. While all Apple Intelligence-compatible devices, including the iPhone 15 Pro and newer models, will receive the core AI upgrades like the new chat-style Siri and onscreen awareness, only devices with 12GB RAM or more can access expressive Siri voices and highly accurate, auto-formatted dictation. This includes the iPhone 17 Pro, iPhone 17 Pro Max, M4 iPad models, M3 Macs, and Apple Vision Pro with M5.

The base iPhone 17 ships with only 8GB of memory, meeting the original Apple Intelligence minimum but falling short of this new threshold. This marks the first time Apple has increased the hardware bar for AI features after initially setting it at 8GB two years ago. The advanced dictation model can now handle punctuation, capitalization, and formatting in real time with improved speech understanding, reducing errors significantly.

For users who dictate messages, notes, or emails regularly, the performance gap will likely be noticeable. Others may not miss the upgraded features. iOS 27 is currently in developer beta, with a public release expected in the fall. Apple continues to emphasize privacy by keeping these AI models on-device, but the move highlights growing hardware stratification within its iPhone lineup.