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The O-I has 880 hit points , 150mm of frontal hull armor , and a top speed of 25 km/h. . The vehicle can equip 2 different gun configurations, allowing for varied playstyles.
Hull & survivability
| Hit points (HP) | 880 |
|---|---|
| Weight | 110.2 t |
| Hull armor (F / S / R) | 150 / 70 / 50 mm |
The front-to-side armor ratio is 2.1:1. This pronounced angling makes the O-I significantly stronger when keeping its front facing the enemy.
Mobility
| Top forward speed | 25 km/h |
|---|---|
| Top reverse speed | 10 km/h |
Forward-to-reverse speed ratio is 2.5:1. Reverse speed is limited, so pre-aim and exposure timing matter more on this vehicle.
Camouflage
| Camo (stationary) | 0.4% |
|---|---|
| Camo (moving) | 0.2% |
Available guns (2)
| Gun | Tier | Damage | Pen | Reload | RoF |
|---|---|---|---|---|---|
| 10 cm Cannon Type 92 (O-I) | 5 | — | — | 12.0s | — |
| 15 cm Howitzer Type 96 (O-I) | 6 | — | — | 26.0s | — |
How O-I compares to its peers
There are 23 tier 6 heavy tanks in WoT, including the O-I. Its 880 HP places it in the top 41% for hit points among same-tier heavy tanks (peer average: 855). Frontal hull armor of 150mm ranks in the top 23% for the class (peer average: 108mm). Top forward speed of 25 km/h is faster than 9% of peer vehicles in this tier and class.
Direct comparisons
- O-I vs A43 BP — tier 6 heavy tank from UK
- O-I vs ARL 44 — tier 6 heavy tank from France
- O-I vs CDT — tier 6 heavy tank from France
- O-I vs Chur Gloriana — tier 6 heavy tank from UK
- See full tier 6 heavy tank tier list — all 23 vehicles ranked
Understand the stats
Want a deeper grasp of what these numbers actually mean in battle? Read the glossary:
- What is DPM — the most important offensive metric
- Alpha damage — single-shot damage and what it means for playstyle
- Penetration — and how it interacts with armor angling
- Hull-down position — the king of defensive plays
- View range — how spotting actually works
About this vehicle
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.
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Frequently asked
What tier is the O-I in WoT?
The O-I is a tier 6 heavy tank from Japan.
Is the O-I a premium tank?
No — the O-I is a researchable tech-tree vehicle, not a premium tank.
What's the top speed of the O-I?
25 km/h forward, 10 km/h reverse.
How much armor does the O-I have?
Hull armor: 150mm front, 70mm side, 50mm rear.