Unreal Engine 5.9 preview is the first UE release built primarily with agentic workflows
nicolascraske · x · 2026-11-09
Epic shipped the Unreal Engine 5.9 MegaJam Preview, calling it the first Unreal Engine release built primarily with agentic workflows:
- A handful of engineers directed fleets of agents working in parallel to port AI tooling from the UE6 branch and implement Web as a target platform, starting from UE4's retired HTML5 code; agents wrote the code while engineers directed, reviewed and tested.
- Epic says the approach already shows benefits — faster releases and bug fixes without pulling focus from UE6.
- The preview had 1 week of development and a shorter QA pass; some agent-written code and parts of the web renderer remain prototypes to refactor.
- New experimental features: expanded Unreal MCP toolsets, AI coding agents directly in Editor, AI-assisted content creation, and running projects in a browser. Timed for the Epic AI MegaJam (Nov 12–15), with agents helping triage bug reports.
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