Epic Games confirmed today that AI coding assistants now sit at the center of work on Unreal Engine 6, Fortnite, and other internal projects. Engineers aren’t writing most code line by line anymore. They’re steering the tools toward the architecture they want, then testing and refining the output over and over so memory use, performance, and scalability stay on target. Inside Epic, the bigger worry is moving too slowly, not adopting the tools too aggressively.
Epic says Claude Code and OpenAI Codex rewrote a D3D12 rendering layer in about a week, work that one engineer might otherwise need three to six weeks to finish. The company also credits the tools with better shader compression, fewer bugs, and stronger Fortnite stability. That part didn’t land cleanly everywhere, though. Epic’s recent “vibe-coded” Epic Games Launcher preview quickly spawned clips of bugs, strange behavior, and one unverified claim that it bricked a PC.
If you follow Unreal Engine or Fortnite closely, this is one to pay attention to. It marks a clear reversal from Epic CEO Tim Sweeney’s earlier public skepticism, reportedly extends to an AI-first Marvel and Star Wars crossover pipeline with less handwritten code and more generated art, and has already split opinion. Some people see faster production. Others are hung up on maintainability, whether developers will still understand the code they ship, what this does to jobs, and the disclosure rules that Epic says Steam politicizes.
You can get Fortnite, Unreal Engine, and the Epic Games Launcher from Epic.
Author: Jesús Bosque
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