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Epic Officially Confirms It’s ‘Vibe Coding’ Unreal Engine 6 and Future ‘Fortnite’ Updates
Epic has confirmed that it is using AI to write much of the code for Unreal Engine 6 and future Fortnite updates. Executive vice-president of development Marcus Wassmer said engineers guide AI tools and refine their output, while Epic sees the risk of adopting AI too slowly as greater than the risk of scepticism.
Wassmer said Epic is iterating with AI rather than generating the engine in one go, with engineers responsible for keeping it within memory, performance and scalability limits. The approach marks a change from a year ago, when chief executive Tim Sweeney denied AI was being used for Unreal Engine updates. The article notes developer concerns about understanding AI-written code, as well as reports of problems with Epic’s AI-coded launcher and a shift towards AI-first development on an unannounced crossover game.
In short
- Epic says AI is writing much of Unreal Engine 6’s code.
- Engineers will guide and refine AI-generated features.
- The move has prompted concerns among developers.
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The strongest fair case each way — we don't pick a winner.
The case for
Using AI to write much of the code could help Epic build and update complex products faster, while engineers guide the tools and check performance, memory use and scalability. Supporters may argue that iterative development with human oversight lets the company gain productivity while retaining responsibility for quality, and that falling behind as AI improves could limit its ability to compete and serve users.
The case against
Relying heavily on AI-generated code may make systems harder for engineers to understand, maintain and debug, especially as the codebase grows. Critics may argue that reported problems with Epic’s AI-coded launcher warrant caution, and that speed or competitive pressure should not outweigh careful testing, transparent disclosure and clear human accountability for software quality.
Explained simply
Epic Games makes Unreal Engine, software used to build video games, and develops Fortnite. Both projects involve large teams of engineers, who write and maintain the code that makes the software work.
AI coding tools can produce code from instructions, but people still need to check how it fits with the rest of a project and whether it works reliably. In this case, Epic’s engineers are described as guiding and refining the tools’ output while keeping practical limits such as speed and memory in view.
The debate matters to game developers who rely on Epic’s tools and to players affected by changes to Fortnite. Using AI could alter how development work is done, while raising questions about whether engineers can understand and maintain code produced with the tools.
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