Xcode 12.5 Beta 3 was released on 2 Mar 2021 and requires macOS 11.0+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_12.5_beta_3/Xcode_12.5_beta_3.xip.
Release notes are located at https://developer.apple.com/documentation/xcode-release-notes/xcode-12_5-beta-release-notes/.
The SDKs it contains are:
- iOS 14.5 (Build 18E5164d)
- macOS 11.3 (Build 20E5196d)
- tvOS 14.5 (Build 18L5173d)
- watchOS 7.4 (Build 18T5169d)
The compilers it contains are:
- clang 12.0.5 (Build 1205.0.22.6)
- swift 5.4 (Build 1205.0.26.4)