With the fifth beta of iOS 27, Apple has expanded voice customization options for Siri AI. Pace and Expressivity can now be adjusted for more of the available voice options instead of just the two American voices. There are seven American voice options and four British voices to choose from, all customizable with different Pace and Expressivity settings. Pace changes talking speed, while expressivity changes emphasis.

Siri AI voice customization is done on-device, so the feature is limited to newer iPhones. You need an iPhone 17 Pro, iPhone 17 Pro Max, or iPhone Air to use voice customization on an iPhone. It's available on Macs with an M3 chip or newer and at least 12GB RAM, and the M4 iPad Pro and newer, also with at least 12GB RAM.

The update, first reported by MacRumors, brings these options to a broader set of voices, making Siri more personalized. As Apple continues refining its AI assistant, on-device processing ensures privacy while delivering richer vocal expression.