According to a listing for the game on the Xbox Store, Fallout 76 is 45.28GB on the Xbox One. At the moment PS4 and PC Fallout 76 download sizes are unknown, but it’s safe to say they should be around the same. We won’t be surprised to see the Fallout 76 beta having the same file size as well considering that progress from it will carry over to the full game.
The Fallout 76 beta release date is October 23 on Xbox One. As the company has a marketing tie-up with Microsoft, the Fallout 76 beta would be on the Xbox One first with PS4 and PC soon to follow on October 30.