What rewards does gta v story mode completion give?

Grand Theft Auto V's story mode is a standalone single-player experience with its own progression system. Unlike Grand Theft Auto Online, which features ongoing updates and reward structures, the story mode does not offer post-completion bonuses that carry over into other game components. The evidence provided focuses on Grand Theft Auto Online as a separate multiplayer game with its own release history and features, but does not indicate any reward system for completing GTA V's story mode. Without additional verified sources confirming specific rewards, I cannot provide details about completion bonuses, money payouts, or unlocks that might be awarded after finishing the main story missions.