Grand Prix 4, commonly known as GP4, is a Formula One racing simulator game co-developed by Geoff Crammond's development studio Simergy and Infogrames' Chippenham development studio, and published by Infogrames. Released for the PC on June 21, 2002, it is the last entry in Crammond's Grand Prix series, and the last entry released under the MicroProse label. Based on the 2001 Formula One season, GP4 is a graphical and physics update from the previous version, Grand Prix 3, which was released in 2000. A modern rerelease on Steam, titled Geoff Crammond Racing 4, is planned for 2026.
Grand Prix 4 featured a heavily revised graphics engine and updated physics, including wet weather driving:
Although the game could be considered a relatively modest commercial success, the chances of a further entry to the series could be considered slim to none because MicroProse's parent company Infogrames dissolved the developer shortly after the game's release. In addition, the Sony Computer Entertainment brand's exclusive licensing deal for Formula One games rules out an update with official stats. An Xbox port of the title was planned for release in late 2002, before being cancelled in October that same year.
Much like its predecessors, Grand Prix 4 continues to garner a strong modding community long after its launch, with numerous non-Formula One racing series, such as Champ Car and the IMSA SportsCar Championship, and Formula One seasons, including the recent season, being represented in the game by dedicated modders.
In December 2025, the current incarnation of MicroProse acquired the rights to the Grand Prix franchise. It announced plans to rerelease all four games, including Grand Prix 4, on Steam with original developer Geoff Crammond. Due to the Formula One license being held by Electronic Arts, the game will be rebranded as Geoff Crammond Racing 4 and include fictional sponsors and names, though Steam Workshop support will be included upon launch.
Grand Prix 4 received "generally favorable reviews" according to the review aggregation website Metacritic.
The game won the award in the Sports category at the British Academy of Film and Television Arts Awards in 2002. It was also nominated for Computer Gaming Worlds 2002 "Sports Game of the Year" award, which ultimately went to Madden NFL 2003. The editors called Grand Prix 4 "one of the better racing games in years past". It was also a runner-up for GameSpots annual "Best Driving Game on PC" award, losing to Rally Trophy.