What's the difference between GT and GTR?

The GT is a roadster, while the GT R is a coupe. The GT is also available in two model options--either the AMG庐 GT Roadster or the AMG庐 GT C Roadster. The GT R, on the other hand, is only offered in one model which is the AMG庐 GT R Coupe.2018 Mercedes-AMG庐 GT R - Mercedes-Benz of Scottsdale