Xcode 12.5.1 Release was released on 21 Jun 2021 and requires macOS 11.0+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_12.5.1/Xcode_12.5.1.xip.
Release notes are located at https://developer.apple.com/documentation/xcode-release-notes/xcode-12_5_1-release-notes.
The SDKs it contains are:
- iOS 14.5 (Build 18E182)
- macOS 11.3 (Build 20E214)
- tvOS 14.5 (Build 18L191)
- watchOS 7.4 (Build 18T187)
The compilers it contains are:
- clang 12.0.5 (Build 1205.0.22.11)
- swift 5.4.2 (Build 1205.0.28.2)