Apple has unveiled a new version of Siri AI during the WWDC 26 keynote, featuring significant enhancements and a dedicated app. One of the standout features is the ability to customize Siri's voice, allowing users to adjust its pace and expressivity through sliders and select accents from a drop-down menu. However, this voice customization is not universally available; it is limited to the latest Apple devices. To access this feature, users must have specific models, including the iPhone 17 Pro, iPhone 17 Pro Max, iPhone Air, and iPad models equipped with M4 chips and at least 12GB of unified memory. Additionally, Mac models with M3 chips and the Apple Vision Pro (M5) are also eligible. Even if devices can run the latest operating systems, they may not support the new Siri voice customization unless they meet these hardware requirements. Apple has strategically reserved this feature for its most advanced devices, reflecting its focus on enhancing user experience with cutting-edge technology.