Game Progress from Xbox 360 to Xbox One

For GTA V, your game progress and achievements do not carry over from Xbox 360 to Xbox One.

Both versions of GTA V (Xbox 360 and Xbox One) are treated as separate games.

Hi,

The game progress will carry over if you're using the
Xbox Play Anywhere version of the game with the same Microsoft account on both devices. If you've purchased different versions of the game from the Microsoft Store and the Xbox Store, the game progress will carry over to the device which is compatible with
the version of the game. For example, if you've purchased the PC version of the game from the Microsoft Store, the progress you'll earn for that game will apply on Windows 10 devices. Same goes with the Xbox version. The progress will carry over on Xbox 360
or on Xbox One depending on the device where you last played the game.

There's a feature for Xbox games wherein you can play Xbox 360 games on Xbox One. This means that progress will be carried over from the Xbox 360 console to Xbox One. For your reference, see

Xbox One backward compatibility FAQ.

We hope we're able to provide you the answer you're looking for. If you have other questions, don't hesitate to get back to us anytime.

It sounds like you've already saved your World of Tanks game progress to the cloud on the Xbox 360, so after you've signed in with your gamertag on your new Xbox One, navigate to the Xbox store and download the Xbox One version of World of Tanks for free. Once World of Tanks is downloaded, open the game and your tanks and game progress from the Xbox 360 should synchronize.

While you can continue your progress on the Xbox One by transferring the Xbox 360 saves to the Cloud, saves are not transferrable between accounts.

While you can continue your progress on the Xbox One by transferring the Xbox 360 saves to the Cloud, saves are not transferrable between accounts.

thanks for the idea, very helpful