Xcode 11.5 GM Seed 1 was released on 18 May 2020 and requires macOS 10.15.2+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_11.5_GM_Seed/Xcode_11.5_GM_Seed.xip.
Release notes are located at https://developer.apple.com/documentation/xcode_release_notes/xcode_11_5_gm_seed_release_notes.
The SDKs it contains are:
- iOS 13.5 (Build 17F65)
- macOS 10.15.4 (Build 19E258)
- tvOS 13.4 (Build 17L255)
- watchOS 6.2 (Build 17T255)
The compilers it contains are:
- clang 11.0.3 (Build 1103.0.32.62)
- swift 5.2.4 (Build 1103.0.32.9)