Epic’s Marcus Wassmer describes AI-assisted debugging and refactoring in Unreal Engine

Epic names build reliability, rendering code and modularity as areas of work. Its executive’s examples are self-reported engineering outcomes, not independent productivity benchmarks.

Marcus Wassmer, Epic’s executive vice president of development, told This Week in Video Games that AI coding tools are being used to develop Unreal Engine code and features. The original report appeared October 27; Game Developer covered it on October 28.

Among his examples are difficult-to-reproduce cooking bugs, shader compression work intended to reduce patch sizes, and a Direct3D 12 rendering-layer rewrite. He says an engineer completed that rewrite in about a week, against an initial estimate of three to six weeks. The comparison is a project estimate supplied by Epic, rather than an external trial.

Wassmer also describes work on making a large codebase more modular so unused functionality can be removed. Human engineers still guide architecture, performance, memory use and scalability. The account does not describe generating an entire engine from a single prompt.

Game Developer’s follow-up places the examples within the wider debate over AI-assisted code in production tooling. Neither report supplies a controlled measurement of long-term maintenance costs or establishes that every development task sees the same speed-up. The concrete contribution is Epic’s description of where it is applying the tools and what outcomes its engineering leadership claims.