The success of the PT-76B prompted the development of a more powerful version. The Object 906 retained the same characteristics of the PT-76B: stabilized, amphibious and very light, but with a more powerful 85 mm cannon. It never went into service or serial production, but if it had, it would have received the designation PT-85. The tank carried a total of 40 shells with 8 armour-piercing and 32 HE projectiles. The protection was not the most important aspect, but it received enough armour to stop artillery fragments, 14.5 mm shots from 100 m, and it was protected against radioactive and nuclear fallout. While the tank was much superior to the PT-76B, it never went into service, it was deemed too complex to operate and produce en masse, so it was discarded and the PT-76 remained in service instead.

Introduced in Update 1.65 "Way of the Samurai", the Object 906 is a very capable tank at its BR. With good mobility and little to no armour, it plays like most light tanks. It can use its good mobility to set up in sniping positions (however it does not have access to a rangefinder). Its biggest advantage is access to a two-plane stabilizer that works at all speeds, and with a very low profile, it's very easy to set up ambushes around capture points to take out dangerous opponents with ease, especially other light tanks that try to rush to the point. It suffers from a poor gun depression like many other Soviet tanks, but its powerful armament and mobility compensate that lack of gun handling. It's also amphibious, which may come in handy in case of an emergency.