The GT4 category was founded by the SRO at the end of 2006 and first introduced in 2007. It debuted in the GT4 European Cup as a cheaper alternative for GT3 racing. The category was added to the British GT Championship in 2008, and the SRO founded the Dutch GT Championship in 2009. The GT4 class was also adapted by several other small national championships.
After an unsuccessful attempt to expand the category in 2012, the SRO introduced the GT4 European Trophy, consisting of five rounds from existing European Championships. This replaced the GT4 European Cup. In 2014, this series merged with the Dutch GT4 Championship to form the GT4 European Series.
Due to a low number of entries, the SRO announced that the GT4 European Series would be split into two championships: the GT4 European Series Northern Cup and the GT4 European Series Southern Cup. The Northern Cup eventually turned back into the GT4 European Series, while the Southern Cup became the FFSA GT Championship.
In North America, IMSA has allowed GT4 cars from mainstream manufacturers to compete in the Grand Sport class of the Michelin Pilot Challenge since 2017. Additionally, they have competed in the Grand Sport X class of the IMSA VP Racing SportsCar Challenge since its inaugural season in 2023.
As of October 2024, over 50 vehicles have gone through the homologation project with the RACB. GT4 cars can either be built directly by the automotive manufacturer or by race teams and tuning companies.
SRO GT4 cars have been either exclusive to or in a distinct class in each of the following series:
As premier class
ADAC GT4 Germany
GTC Endurance Challenge
GT4 America Series
GT4 Australia Series
GT4 Italy
GT4 Russia
GT4 Winter Series
Michelin Pilot Challenge
SRO GT Cup
Supercars Endurance Series (GT4 South)
Summerset GT New Zealand Championship
As subsidiary class
24H Series and 24H Series Middle East
APEX One
Austrian GT
Baltic Touring Car Championship
Belcar
Britcar
British GT Championship
Campeonato de España de GT
China Endurance Championship
China GT Championship
CEZ Circuit Endurance
Danish Endurance Championship
DMV Super Touring & GT Cup
Endurance Brasil
Golf Pro Car
GT America Series
GT Cup Championship
GT Cup Open Europe
GT Cup Series
GT Series Cup Brasil
GT Summer Series
GT Winter Series
IMSA VP Racing SportsCar Challenge
International GT
Nürburgring Langstrecken series
Pikes Peaks International Hill Climb
SRO Japan Cup
Supercar Challenge
Superrace Championship
Super Taikyu Series
Thailand Super Series
World Racing League