Players of Grand Theft Auto Online have an all new game mode to try their hands at starting today- “Inch By Inch” is a new team-based adversary mode that is available on Xbox One, PS4, and PC now (yep, sorry Xbox 360 and PS3 players- you guys get left out again, though to be fair, Rockstar confirmed that they would be dropping support for the last gen versions quite a while back now).
GTA Online is the multiplayer component of GTA 5. It is free to play (although it features microtransactions) and is available to play on PS3, PS4, Xbox 360, Xbox One, and PC (though, again, only the current gen versions get updated with the latest content and support).
Source: Rheena.com