Epic utilise l'IA sur le code d'Unreal et veut lever son interdiction d'entraînement

Epic Games has now said two things on the record about AI and its engine in the space of a week. On October 23, CEO Tim Sweeney answered a developer who asked whether AI tools were being used to build Unreal Engine: "Yes, we are now using AI tools to develop code for Unreal Engine." Epic then confirmed to This Week in Videogames that this covers code and features for Unreal Engine 6 and Unreal Editor for Fortnite. And in posts on X that Game Developer reported on October 27, Sweeney said Epic is working to remove the EULA clause that stops anyone training AI on what Unreal Engine and MetaHuman produce.

AI in the engine's own code

The confirmation is a change of position. This Week in Videogames notes that in November 2025 Sweeney had denied Epic was using AI tools to build Unreal Engine features. Marcus Wassmer, Epic's EVP of Development, told the outlet the tools are now "helping across a broad spectrum of development."

It also goes further than Epic's own description a few months ago. According to Unite.AI, a June 22 post by Wassmer said Epic had opened up code generation and AI analysis across its engineering teams but that "most of those use cases do not yet generate mainline Unreal Engine code", and that Epic was building "an MCP with integrations for Claude, Gemini, and other models" into its development pipeline. On October 12, Sweeney wrote on X: "We have a huge pivot underway here at Epic, moving developers around to retool for maximum AI acceleration."

The EULA restriction Epic wants to remove

The second statement is about licensing, not tooling. Asked on X whether Epic restricts AI training on the outputs of Unreal Engine and MetaHuman, Sweeney replied: "Yes currently but we are working to remove this restriction from EULA terms." He added that "each game using these tools is released under terms of the developers' choosing which can allow or restrict AI training."

• Today: the restriction is still in the EULA. Nothing has changed yet.
• Planned: Epic intends to drop it. Game Developer reports no date or timeline, and Epic had not replied to its request for comment at publication.
• Per game: by Sweeney's account, whether a finished game's content can be used for AI training would be up to the developer who ships it.
• Fortnite IP is a separate question. In the same thread Sweeney wrote that Epic does not let people use Fortnite IP without permission or compensation.

What it means for island creators

For now, very little changes day to day in UEFN. The tools you publish with are the same this week as last; the difference is that Epic has confirmed AI-assisted code is going into the editor you use and into Unreal Engine 6, which Epic plans to build by merging Unreal Engine 5 and UEFN into one product over roughly the next two years, per Unite.AI. If you are tracking editor stability, that is the context for future release notes.

Disclosure on the marketplace side is not going away. Sweeney also defended Fab's AI disclosure, calling Fab "a business to business marketplace" whose customers "are operating under contracts that require them to understand the providence of all content in their game," as GamingOnLinux reports. He made the point in the same discussion in which he criticized Valve's requirement that Steam developers disclose AI use.

The next concrete date for AI and UEFN is Epic's AI MegaJam, which runs November 12 to 15 and lets teams build in Unreal Engine or UEFN with AI tools. The EULA change has no date yet; until Epic publishes new terms, the current ones apply.