By 2010, GT3 cars have become common in GT300 class. Meanwhile, in present-day GT300, the horsepower range varies from around 400 to just over 550 horsepower however, GT300 cars have far less downforce than their GT500 counterparts. However, the current generation of GT500 powerplants produce in excess of 650 horsepower these cars form the base of Gr.2 class in Gran Turismo Sport. The names of the categories derive from their traditional maximum horsepower limit - in the early years of the series, GT500 cars would have no more than 500 horsepower, GT300 cars would max out at around 300 hp. The cars are divided into two groups GT300 and GT500. Autobacs has served as the title sponsor of the series since 1998, during which the series was still named JGTC. The series is sanctioned by the Japan Automobile Federation (JAF) and run by the GT Association (GTA). It is the top level of sports car racing in Japan.

Originally titled as the Zen Nihon GT Senshuken (全日本GT選手権), generally referred to as either the JGTC or the All Japan Grand Touring Car Championship, the series was renamed to Super GT in 2005. Super GT (stylized as SUPER GT) is a grand touring car racing series that began in 1993.