This is the 15th-century Odachi Masayoshi, forged by blacksmith Sanke Masayoshi.
The blade alone is 2.25 meters long. The handle almost a meter.
It is 3.77 meters long in total.
The blade is 2.3 cm thick. It weighs 14.5 kilograms.
It is twice as long and twice as heavy as a “normal” one of these Japanese long swords.
I guess the advantage it has is that it keeps the fighter out of reach of other normal length swords.
But a fighter has to be somewhat flexible and be able to move around, and that seems almost impossible with this sword.
In any case, it seems that the fighters had someone to help them carry the sword.
And such a long sword could perhaps also be used on horseback, like a spear.