Apple、デベロッパー向けにXcode 26.1 beta 3 (17B5045g)、iOS 26.1 beta 4 (23B5073a)、iPadOS 26.1 beta 4 (23B5073a)、macOS 26.1 beta 4 (25B5072a)、macOS Sonoma 14.8.2 RC 3 (23J124)、macOS Sequoia 15.7.2 RC 3 (24G322)、tvOS 26.1 beta 4 (23J5571a)、visionOS 26.1 beta 4 (23N5042a)、watchOS 26.1 beta 4 (23S5031a)を配布開始
https://developer.apple.com/news/releases/