Access to Grand Theft Auto Online is free with your copy of Grand Theft Auto V. On October 1st there will be a small downloadable Title Update released on PlayStation Network and Xbox LIVE.
Rockstar has provided details on how you can access GTA Online once it's launched. Here’s some more information to share to help get everyone ready for tomorrow!.
GTA Online will require user to download a small update. Upon installation of that Title Update, direct access to begin GTA Online will be unlocked in your GTAV game menu. You will be able to jump right into GTA Online via the 4th (bottom) slot in your GTAV character wheel.