A close combat variant of the GNX-607T GN-XII, the GN-XII Sword is created using operating data from the Team Trinity's Gundam Thrones. What set the GN-XII Sword apart from the standard GN-XII are a new head unit and the equipping of the GN Buster Sword, a large sword that can generate a GN Field on its surface for offensive and defensive purposes. Aside from these changes, the GN-XII Sword is the same as the standard GN-XII.
During combat, the GN-XII Sword can work cooperatively with other GN-XIIs. It has been deployed in a three unit team, where it restricts the enemy machine's movement using close combat, while the GN-XII and GNX-607T/BW GN-XII Cannon shoot from close and long range respectively. It can also partner with the GN-XII Cannon, providing defense as the latter shoots at the enemy.