There is no word yet on what measures are in place to detect and ban mods, if any, but it is likely Rockstar will come down hard on any who try to use them during Online play. Mods have not been officially banned in GTA V, but modders and mod users should be cautious.
With that many players and with the PC community's propensity to fiddle with their games' files, it comes as no surprise that there are already several mods available for GTA V on PC. So have you been finally enjoying Grand Theft Auto V on your PC, after all of the delays? Congratulations to all one million of you and counting! The PC version has been out less than a month, but it's already shot to the top of Steam's list of top-played games.