Epic VP says AI code tools have stomped out decade-old 'non-deterministic

Imran Khan,Contributing Editor

October 28, 2026

schedule2 Min ReadImage via Epic Games.

Epic Games has indicated an AI-first pivot recently, centering Unreal Engine on facilitating AI development, using GenAI to build game assets, and updating the Unreal Engine EULA in the future to allow AI to be trained off the output. But so far, the company has not detailed the ways in which it will be using AI to build its own software, including the Unreal Engine. This Week in Video Games reports a more specific answer from Epic, confirming that Unreal Engine itself will be shaped by AI.

"As we mentioned back at Unreal Fest in Chicago on stage and in interviews, we are definitely using AI to develop code and features for Unreal Engine," said Marcus Wassmer, the Executive Vice President of Development at Epic, in response to comment requests from This Week in Video Games. "Almost all development happening right now is being done in the dev streams attached to Fortnite, UEFN [Unreal Editor for Fortnite], and UE6. There’s a possibility of a 5.9. If we make it, it would be a relatively modest update for specific systems and will include changes developed with AI. Generally speaking though we’re working as hard as we can on UEFN and UE6."

Wassmer went on to explain that tools like Claude and Codex have stamped out "non-deterministic cooking bugs" that Epic has been trying to eliminate for a decade. AI tools, Wassmer claims, also help in automatic monitoring of PC stability in Fortnite to alert Epic to driver/hardware combinations that are causing problems and would have taken more work to root out by hand.

"The tools are helping us not just develop code and features, but to keep the engine more stable as we work, trim, and streamline it, and really modernize it in a way that we haven’t been able to before given the size, complexity, and age of the engine code."

Epic recently claimed that it rebuilt the Epic Game Launcher through "vibe coding," stating that it runs notably faster than before. Wassmer confirms this process is being used for more than just the Epic Game Store. Engineers are not writing the bulk of the code, but Wassmer insists that they are controlling the scope of its use.

While surveys in recent years have shown that game developers are worried about generative AI, Wassmer seems to show no such compunction, saying that the benefits to the company far outweigh any potential concerns

"We are more concerned about the risks of moving too slowly than we are about AI skepticism,” Wassmer says. "We think that in pretty short order doing AI development for basically all software will be ubiquitous because software done correctly with AI will simply be better and be more capable of responding quickly to customer feedback than software done without. The best way to counter any skepticism is through the quality of the games and tools we’re able to deliver."

Epic GamesGame Engines & Development ToolsTop StoriesGenerative AI, Machine Learning, & LLMs

About the Author

Imran Khan

Contributing Editor

Imran Khan has been in the games industry in various forms for over two decades. He has been a former senior editor at Game Informer, a professional loudmouth at Kinda Funny, and news director at Fanbyte. He has also been doing PR for Vicarious PR and Head of U.S. PR for Japanese VR studio MyDearest, in addition to Producer work on their latest title Brazen Blaze.

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