What is the latest ASP .NET MVC version?

There is asp.net-mvc-5.2.3 which is last version before they went to asp.net-core-mvc. Web API 2.2 also shares the 5.2.3 version number. Check Nuget

MVC 6 was originally part of ASP.NET 5 and suppose to be the next version, but due to major changes in the code base, it was decided that it needed to become its own new framework, they decided to change its name from ASP.NET 5 to ASP.NET Core. which is the suggested latest version to use going forward for new projects.