query: How many installments does Gran Turismo currently have?
passage: Gran Turismo 4
Gran Turismo is a PlayStation Portable game developed by Polyphony Digital. The game was announced at the E3 Sony press conference on May 11, 2004, the same conference where Sony announced the PlayStation Portable. It has since been delayed repeatedly and its completion has been pushed back. At E3 2009, Gran Turismo PSP was finally confirmed for an October 1, 2009 date, and was launch title for the PSP Go.[16] The game was intended to be an exact port of Gran Turismo 4, although it could include cars from Gran Turismo 5 Prologue and cars to be featured in Gran Turismo 5.[17]
passage: Gran Turismo 6
On May 16, 2014, Volkswagen announced the fourth Vision GT car, the "Volkswagen GTI Roadster Vision Gran Turismo". A full-scale model of the car appeared in the Wörthersee GTI Meeting in Reifnitz, Austria on May 29, 2014. The car was included with the 1.09 update.