The T-64B is the third variant of the T-64 main battle tank family. It has many improvements over its predecessor, including a redesigned armour layout, a better 1A33 fire control system, a new 9K112-1 "Kobra" ATGM system, an improved 125 mm 2A46-2 tank gun, a 2E26M two-plane fully automatic stabilisation system, and a new 6ETs40 autoloader. T-64B variants were fitted with stronger upper hull glacis armour beginning in 1985, and older T-64B variants were upgraded with a 16 mm armour plate.

Introduced in Update 1.77 "Advancing Storm", the T-64B is a formidable opponent on the battlefield. Its triple-layer composite hull armour can withstand most enemy hits; however, its lacklustre engine power can be disappointing. The tank has access to a vast arsenal of ammunition that is more than capable of dealing with any type of enemy on the battlefield. The tank's low profile allows players to avoid detection and utilize forms of cover that other tanks cannot. Additionally, players have access to a "Kontakt-1" explosive reactive armour (ERA) upgrade, which significantly alters the tank's appearance. The ERA is shaped like a "pike" or triangular prism. The appearance of the hull will also change, as it will be covered in ERA and the distinctive triangle at the front will be removed. An extra armour plate will be added to the lower plate.