The GT by Citroën concept car was specially created, designed and produced for the upcoming video game Gran Turismo 5 and was included through download in its latest version Gran Turismo 5: Prologue. Its designer came up with the project and sold it to both Polyphony Digital and Citroën.

The car's exterior design was made by Takumi Yamamoto, a Japanese designer from Jean-Pierre Ploué's Style Citroën design team. Takumi Yamamoto was a childhood friend of Kazunori Yamauchi, director of Polyphony Digital and creator of the popular Gran Turismofranchise, also known as "Gegge". According to a Yamauchi interview at the Paris Motor Show 2008, he and Yamamoto started collaborating on this project back in 2003. A press release published on the North American Gran Turismo official website describes the Citroën and Polyphony Digital collaboration as a « a joint effort first talked about at the Geneva Motor Show past March[2008].Yamamoto convinced Jean-Pierre Ploué to submit his concept to Citroën's head office in Paris who agreed to start the production process and manufacture the real car. The concept car's rear was carefully designed to fit what the gamers will actually see in the game since it is the more powerful featured vehicle, argues Yamamoto

In June 2009, Citroën confirmed plans to produce a limited number of GTs for sale to the public. Only six will be built, each costing $1.8 million. In July 2010, rumours that production was suspended began to surface