Tier VI Heavy Tank Japan

O-I

Tank ID 5473

Vehicle description

Wargaming Tankopedia

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 weighed 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 its assembly.

Description from the Wargaming Tankopedia · Language selected automatically

Technical profile

Standard configuration

Hit points

1,100

Weight

150.4 t

Forward speed

25 km/h

Reverse speed

10 km/h

View range

370 m

Signal range

425 m

Armour

	Front	Sides	Rear
Hull	150	70	50
Turret	150	120	60

Engine: 2x Kawasaki Type 98 Kou (O-I) · 1,200 hp

Radio: Type 96 Mk. 4 Bo

Armament

Standard gun and ammunition

10 cm Cannon Type 92 (O-I)

Calibre 105 mm

Reload time 12.0 s

Aiming time 3.2 s

Dispersion 0.43

Rate of fire 5.00 /min

Ammo capacity 100

Shell types

AP · armour-piercing Damage 225 / 300 / 375

Penetration 131 / 175 / 219 mm

AP · armour-piercing Damage 225 / 300 / 375

Penetration 151 / 201 / 251 mm

HE · high explosive Damage 270 / 360 / 450

Penetration 40 / 53 / 66 mm

Marks of Excellence

Damage thresholds

Combined Damage (Damage + Assist + Tracking)

Combined damage

1 Mark ≥ 65 %

1,355

2 Marks ≥ 85 %

1,970

3 Marks ≥ 95 %

2,545

Approximation based on WN8 expected values — not an official Wargaming figure.

WN8 Expected Values

XVM reference

XVM Expected Values for WN8 calculation (per battle)

Per battle (avg.)

Avg. damage 821

Avg. spotted 0.80

Avg. kills 1.05

Avg. defence 0.66

Exp. win rate 54.21 %

Community stats

Measured, not estimated

Average across every profile stored on WG-Watch — real battles instead of expected values.

Win rate

54.16 %

Avg. WN8

1,557

Battles

34,725

As of Aug 31, 2026

Rank 42 of 91 at Tier VI

Best players on this tank

By WN8

From the stored profiles, minimum 50 battles on this vehicle. Updated daily.

#	Player	WN8	Battles	Win rate
1	Yzne eu	4,135	117	71.79 %
2	Ursid eu	3,443	128	78.13 %
3	Quickfingers eu	3,353	104	61.54 %
4	skill4ltu eu	3,295	250	67.60 %
5	GehakteMolen eu	3,292	93	61.29 %
6	H0bg0bl1n eu	2,914	61	65.57 %
7	Panzerfighter_ eu	2,742	108	68.52 %
8	Xilense eu	2,732	192	66.15 %
9	3rdMarker eu	2,732	210	61.90 %
10	RedHagen eu	2,597	245	62.04 %