Apple、デベロッパー向けにXcode 26 beta 4 (17A5285i)、iOS 26 beta 4 (23A5297i)、iPadOS 26 beta 4 (23A5297i)、macOS 26 beta 4 (25A5316i)、tvOS 26 beta 4 (23J5316g)、visionOS 26 beta 4 (23M5300g)、watchOS 26 beta 4 (23R5317g)配布開始
https://developer.apple.com/news/releases/