Yes, you can gamble in GTA 5 story mode through various activities available in the game world.
The main gambling activities include betting on horse races at the Los Santos Turf Club, playing blackjack and three-card poker at the Diamond Casino & Resort, and participating in street races with betting options. 
To gamble at the Diamond Casino, you need to purchase a membership which costs GTA$500. The casino offers slot machines, roulette, blackjack tables, and poker games where you can win or lose in-game money.
Horse racing betting is available at the racetrack where you can place bets on different horses and watch the races unfold. The odds change based on each horse\“s performance history.
Remember that all gambling in GTA 5 uses in-game currency only and doesn\“t involve real money. Your gambling winnings or losses only affect your character\“s bank account within the game. |
