What game engine powers Metal Gear Solid V: The Phantom Pain?

Metal Gear Solid V: The Phantom Pain is powered by the Fox Engine.

Konami developed the engine under Hideo Kojima's direction for high-fidelity, cross-platform game development. It supports the game's large open areas, dynamic weather, lighting, physics, and seamless movement between exploration and mission play.

The engine debuted publicly through the 2012 technology demonstration known as “The Phantom Pain,” before Konami confirmed its connection to the Metal Gear series. It was subsequently used for Metal Gear Solid V: Ground Zeroes and The Phantom Pain.

Fox Engine is not the same as the fictional FOX unit or the game's real-world development team. The name is a technical reference tied to the Metal Gear universe, while the engine itself is software created for video games.