iOS 27 beta 4 now available as Apple tests major Siri AI upgrade

Apple has released the fourth developer betas for iOS 27, iPadOS 27, tvOS 27, and visionOS 27. iOS 27 introduces Siri AI, a chatbot utilizing personal data and onscreen awareness. macOS Golden Gate beta 4 features design improvements, including Liquid Glass opacity adjustments, uniform toolbars, and updated window shadowing. These updates follow the summer beta cycle ahead of a fall public release, while macOS 26.6 release candidates are also available for developers and the public.