O-I Experimental

O-I Experimental stats at a glance

The O-I Experimental has 736 hit points , 125mm of frontal hull armor , and a top speed of 25 km/h. Its strongest gun configuration deals 360 damage per shot with 60mm of armor penetration , giving it a theoretical maximum DPM of 2056. The vehicle can equip 3 different gun configurations, allowing for varied playstyles.

Hull & survivability

The front-to-side armor ratio is 1.8:1.

Mobility

Forward-to-reverse speed ratio is 2.1:1. Reverse speed is limited, so pre-aim and exposure timing matter more on this vehicle.

Camouflage

Available guns (3)

With the top-tier gun, the O-I Exp. can theoretically output up to 2056 damage per minute at sustained fire (shot damage × rounds per minute). Lower-tier guns generally trade DPM for faster reload or better handling — see the full gun table above.

How O-I Exp. compares to its peers

There are 17 tier 5 heavy tanks in WoT, including the O-I Exp.. Its 736 HP places it in the top 31% for hit points among same-tier heavy tanks (peer average: 707). Frontal hull armor of 125mm ranks in the top 12% for the class (peer average: 93mm). Top forward speed of 25 km/h is faster than 0% of peer vehicles in this tier and class. The strongest gun deals 360 damage per shot, higher than 94% of comparable vehicles. Best penetration of 60mm puts it in the top 100% for armor-piercing capability in its class.

Direct comparisons

• O-I Exp. vs T1 Heavy — tier 5 heavy tank from USA
• O-I Exp. vs T14 — tier 5 heavy tank from USA
• O-I Exp. vs T14 (tr.) — tier 5 heavy tank from USA
• See full tier 5 heavy tank tier list — all 17 vehicles ranked

Related tier 5 heavy tanks

• BDR G1 B — France
• Churchill I — UK
• Churchill III — USSR, premium
• Excelsior — UK, premium
• KV-1 — USSR
• KV-1SA — USSR, premium
• KV-1 shielded — USSR, premium
• KV-220-2 Beta Test — USSR, premium
• All Japan tanks · Tier 5 premium tanks

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 this superheavy tank was initiated by Colonel Iwakuro from the Army Ministry of Japan. The project was carried out by the Mitsubishi company, therefore the vehicle became known as the Mi-To. In the army, the tank was designated the O-I. Details of the project are largely unknown.

Frequently asked