As of my last update in January 2022, Gran Turismo Sport features a diverse selection of cars, ranging from classic automobiles to cutting-edge racing machines. The total number of cars available in the game has expanded over time through updates and expansions.
Initially, Gran Turismo Sport launched with around 160 cars. However, through post-launch updates and downloadable content (DLC), the roster of vehicles has grown significantly. The addition of new cars has been a consistent feature of the game's ongoing support, with Polyphony Digital regularly introducing new vehicles to enhance the gaming experience for players.
For the most accurate and up-to-date count of cars available in Gran Turismo Sport, I recommend checking the official sources provided by Polyphony Digital or the game's official website. These platforms typically provide comprehensive information about the game's content, including the latest additions to its car lineup.