iOS 27 beta 4 now available as Apple tests major Siri AI upgrade - 9to5Mac

What the report says

9to5Mac reports that Apple has made the fourth developer beta of iOS 27 available for testing, with build number 23G71. The release replaces the third developer beta, which the outlet says had two versions, and is part of Apple’s regular summer testing period before a broader rollout expected in the fall.

According to the report, eligible iPhone users enrolled in the Apple Developer Program can access the beta through the Settings app under Software Update and Beta Updates. 9to5Mac notes that Apple issued the first public beta on July 13 and expects this latest developer build to correspond to a second public beta next week, though Apple’s public release schedule can vary.

The article frames iOS 27 as a major artificial intelligence update for the iPhone, led by a redesigned Siri built on Apple Intelligence and newer Apple Foundation Models. Reported Siri changes include more conversational interactions, personal context, awareness of on-screen content, deeper app actions, a Dynamic Island-related interface, and a separate Siri app for reviewing conversations across devices. The report also says Visual Intelligence is being tied more closely to Siri, including through the Camera app.

Beyond Siri, 9to5Mac says iOS 27 expands AI features across apps such as Photos, Safari, Mail, Messages, Phone, Shortcuts, Home, and Passwords, with some functions running on-device and others using Apple’s Private Cloud Compute. The outlet adds that iOS 27 supports iPhone 11 and later plus newer iPhone SE models, but some AI features require more recent hardware. As with any developer beta, users should expect instability, possible battery issues, and app compatibility problems.