What heist mechanics are exclusive to gta online?

Grand Theft Auto Online introduced heist missions as a major gameplay feature that requires 2-4 players to cooperate through complex multi-phase operations. These heists include The Fleeca Job, The Prison Break, The Humane Labs Raid, The Series A Crap Heist, The Pacific Standard Job, The Diamond Casino Heist, and The Union Depository. Each heist requires careful planning with multiple approach options such as stealth, aggressive assault, or entry/exit strategies. Players must purchase and customize their own apartments or businesses to serve as planning boards where they can buy different equipment, weapons, and vehicles for each job. The mechanics include role assignments where different players handle hacking, driving, shooting, and other specialized tasks. The Diamond Casino Heist introduced additional layers like using disguises and avoiding security systems, while The Union Depository added time-sensitive elements and multiple escape routes. These cooperative heist missions require coordination, communication, and strategic decision-making that are fundamentally different from the solo-focused heists in GTA V's story mode.