The first developer beta of iOS 27 hides one of its most anticipated features: the advanced AI-powered dictation system is not enabled by default. Apple has chosen to leave the functionality as an optional preview, accessible only to those with an iPhone 17 Pro, iPhone 17 Pro Max, or iPhone Air. The decision reflects Cupertino's strategy of gradually introducing the heaviest AI capabilities on high-end devices.
A 20-billion-parameter AI model for real-time dictation
At the core of the new dictation is the AFM 3 Core Advanced model, a natively multimodal system with 20 billion parameters. Unlike traditional models that load the entire network into DRAM, Apple has developed a sparse architecture that activates only one to four billion parameters per request, thanks to a lightweight routing mechanism called Instruction-Following Pruning. The full model resides in flash memory, while a dynamic expert selection system ensures fast and accurate responses without overloading the chip.
Sponsored Protocol
Accuracy improved by 44.7% over previous system
In internal tests conducted by Apple across seven quality dimensions (punctuation, capitalization, layout, meaning capture, disfluency handling, and style), the new dictation was preferred overall by a margin of 44.7% versus 17.6% for the old system. Beta testers have noticed a much smoother auto-correction for capitalization and punctuation, reducing subsequent manual corrections. Transcription quality remains the same even without a network connection because processing happens entirely on-device.
Sponsored Protocol
Stringent hardware requirements exclude base iPhone 17
The need for 12GB of RAM to run the AFM 3 Core Advanced model limits compatibility to the most powerful devices. In addition to the iPhone 17 Pro and iPhone Air, the AI dictation works on Vision Pro with M5 chip, iPads with M4 or later and 12GB RAM, and Macs with M3 or later and at least 12GB RAM. The standard iPhone 17, with only 8GB, remains excluded. The same model also powers the new customizable expressive Siri voices, another optional preview in the beta.
The future of AI dictation in iOS 27 between beta and final release
At this point it is unclear whether Apple will turn on AI dictation by default in the public release of iOS 27 expected this fall. During the summer beta cycle, the feature might switch from opt-in to enabled by default, but the company must balance user experience with memory and battery constraints. For developers building voice dictation apps, this innovation offers an opportunity to integrate more natural transcriptions with fewer errors, leveraging Apple's AI infrastructure. Insights on AI talent management can be found in the article Meta AI Workers Revolt in 2026, which examines HR challenges in the tech sector. For a technical explanation of how on-device AI models work, see the Wikipedia page on on-device AI.
Sponsored Protocol
Source: https://www.macrumors.com/2026/06/22/advanced-ai-dictation-not-enabled-by-default
