Epic admits to using AI in core development, calling it 'vibe-coding' for faster innovation
Epic Games has officially confirmed that it is leveraging AI tools to assist in coding major projects, including Unreal Engine 6 and Fortnite. The company describes the process as 'vibe-coding,' where engineers guide AI to generate code while maintaining architectural control. This move reflects a broader industry shift toward AI-assisted development, despite lingering concerns about quality and ethics.
In October 2026, Epic Games publicly confirmed its use of AI tools in core development, coining the term “vibe-coding” to describe a workflow where engineers guide AI systems like Claude Code and Codex to generate code for major projects including Unreal Engine 6 and Fortnite. Marcus Wassmer, Epic’s executive VP of development, stated that nearly all current development occurs within dev streams tied to Fortnite and UE6, emphasizing that engineers remain in control of architectural direction while leveraging AI for efficiency. Specific outcomes cited include the near-elimination of long-standing non-deterministic cooking bugs, a 3–6 week rendering layer rewrite completed in about one week, and significant improvements in shader compression that reduce patch sizes. These claims were made in response to growing industry scrutiny over AI use, particularly following Steam’s controversial AI disclosure policy, which Tim Sweeney criticized as “partisan” and politically motivated. The company has also previously hosted an AI game jam—though later walked back mandatory AI participation—highlighting a pattern of bold experimentation despite public backlash.
The shift reflects Epic’s broader strategic stance: prioritizing speed and innovation over caution, with Wassmer stating they are more concerned about the risks of moving too slowly than AI skepticism. This approach builds on earlier internal announcements from June 2026, when Wassmer first acknowledged broad AI adoption across ba
Epic’s embrace of “vibe-coding” could reshape expectations for software development, particularly in gaming, where performance and innovation are paramount. By openly admitting AI-driven workflows, Epic may be setting a precedent that pressures competitors to follow suit or risk falling behind in feature delivery and optimization. This transparency may empower consumers—especially PC gamers—to make informed choices about which platforms or games they support, potentially influencing market dynamics. However, the broader impact on developer morale and job security remains uncertain; while AI accelerates certain tasks, it may also devalue traditional coding expertise. A comparable case is the early adoption of automated testing tools in the 2000s, which initially sparked fears of obsolescence but eventually evolved into complementary practices. What’s next could include regulatory scrutiny over AI disclosure requirements, especially if other companies adopt similar models without transpa