Xcode 15.0 RC 1 was released on 12 Sep 2023 and requires macOS 13.5+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_15_Release_Candidate/Xcode_15_Release_Candidate.xip.
Release notes are located at https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes.
The SDKs it contains are:
- iOS 17.0 (Build 21A325)
- macOS 14.0 (Build 23A334)
- tvOS 17.0 (Build 21J351)
- watchOS 10.0 (Build 21R354)
The compilers it contains are:
- clang 15.0.0 (Build 1500.0.40.1)
- swift 5.9 (Build 5.9.0.128.108)