Xcode 15.4 RC 1 was released on 7 May 2024 and requires macOS 14.0+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_15.4_Release_Candidate/Xcode_15.4_Release_Candidate.xip.
Release notes are located at https://developer.apple.com/documentation/xcode-release-notes/xcode-15_4-release-notes.
The SDKs it contains are:
- iOS 17.5 (Build 21F77)
- macOS 14.5 (Build 23F73)
- tvOS 17.5 (Build 21L566)
- watchOS 10.5 (Build 21T569)
- visionOS 1.2 (Build 21O5565d)
The compilers it contains are:
- clang 15.0.0 (Build 1500.3.9.4)
- swift 5.10 (Build 5.10.0.13)