The follow-up game, Gran Turismo 5, was released in 2010 for the PlayStation 3. A PSP enhanced port entitled Gran Turismo Mobile was originally planned for development, but was later renamed to Gran Turismo, which was released October 1, 2009. A limited-edition, Gran Turismo 4 Online test version, was released in Japan in summer 2006. The Chinese, Japanese, and South Korean releases of the game were bundled with a 212-page driving guide and lessons on the physics of racing. Gran Turismo 4 was well-received critically and a commercial success, becoming one of the highest-selling games of 2005, and the third best-selling game on the PlayStation 2. The game also features 51 tracks, many of which are new or modified versions of old Gran Turismo tracks, with some notable real-world additions. The game features over 721 cars from 80 manufacturers, from as early as the 1886 Daimler Motor Carriage, and as far into the future as concepts for 2022.

Originally planned for a 2003 release, Gran Turismo 4 was delayed for over a year and a half by Polyphony Digital, and had its online mode removed. It was developed by Polyphony Digital and published by Sony Computer Entertainment and was released on December 28, 2004, in Japan and Hong Kong, February 22, 2005, in North America, and March 9, 2005, in Europe, and has since been re-issued under Sony's 'Greatest Hits' line. The online mode features a robust system for players to race with up to six other players and interact and chat with others to form an automotive community.Gran Turismo 4 is a 2004 racing video game for the PlayStation 2, the fourth installment in the main Gran Turismo series and the sixth for the overall series.

Courses include existing closed racing circuits to specially designed city courses, reaching a total count of up to 100 tracks. In offline gameplay, players will have the opportunity to race in enhanced arcade and simulation modes, experiencing more than 500 authentic automobiles from manufacturers around the world, with a range from vintage to modern vehicles. Highly detailed vehicles and environment mapping create broadcast-quality graphics, from light and competitor car reflections on the player's automobile to leaves on a tree shaking in the wind. New technology immerses the player in real-life environments such as New York City and the Grand Canyon. In Gran Turismo 4 the characteristics of the cars are realistically designed and calculated so that they handle as per the real-life physics of that particular vehicle, taking into account weight, speed, friction, wind and more.

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