Xcode 11.0 Beta 6 was released on 19 Aug 2019 and requires macOS 10.14.4+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_11_Beta_6/Xcode_11_Beta_6.xip.
Release notes are located at https://developer.apple.com/documentation/xcode_release_notes/xcode_11_beta_6_release_notes.
The SDKs it contains are:
- iOS 13.0 (Build 17A5556d)
- macOS 10.15 (Build 19A536d)
- tvOS 13.0 (Build 17J5549c)
- watchOS 6.0 (Build 17R5556d)
The compilers it contains are:
- clang 11.0.0 (Build 1100.0.33.5)
- swift 5.1 (Build 1100.0.270.6)