Comparing: Object 244 vs. O-I

A further development of the experimental tank Object 237. The Object 244 featured a more powerful gun. The fighting compartment was slightly changed: the radio was placed in a turret recess, a more efficient fan was installed, and the ammo rack and periscopic sight were modified. The driver's compartment and engine-transmission compartment were not modified. The vehicle never entered service due to problems with the gun barrel.

Development of the superheavy tank was started after the Battles of Khalkhyn Gol in 1939. The vehicle was designed as a maneuverable fire unit that was unprecedented in scale—its hull alone weighted 100 tons. Only one prototype was built, without a turret and made of construction steel. Trials were discontinued due to the unreliable engine; at the end of 1944, the prototype was scrapped. The 15-cm howitzer was to be mounted on the tank after the assemble.