Xcode 8.2.1 Release was released on 19 Dec 2016 and requires macOS 10.11.5+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_8.2.1/Xcode_8.2.1.xip.
Release notes are located at https://developer.apple.com/library/content/releasenotes/DeveloperTools/RN-Xcode/Chapters/Introduction.html#//apple_ref/doc/uid/TP40001051-CH1-SW157.
The SDKs it contains are:
- iOS 14C89
- macOS 16C58
- tvOS 14U591
- watchOS 14S471a
The compilers it contains are:
- clang 8.0.0 (Build 800.0.42.1)
- swift 3.0.2 (Build 800.0.63)
- LLVM-GCC 3.9.0 (Build )