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Unreal Engine — Version Reference

Field Value
Engine Version Unreal Engine 5.7
Release Date November 2025
Project Pinned 2026-03-25
Last Docs Verified 2026-03-25
LLM Knowledge Cutoff May 2025

Knowledge Gap Warning

The LLM's training data likely covers Unreal Engine up to ~5.3. Versions 5.4, 5.5, 5.6, and 5.7 introduced significant changes that the model does NOT know about. Always cross-reference this directory before suggesting Unreal API calls.

Post-Cutoff Version Timeline

Version Release Risk Level Key Theme
5.4 ~Mid 2025 HIGH Motion Design tools, animation improvements, PCG enhancements
5.5 ~Sep 2025 HIGH Megalights (millions of lights), animation authoring, MegaCity demo
5.6 ~Oct 2025 MEDIUM Performance optimizations, bug fixes
5.7 Nov 2025 HIGH PCG production-ready, Substrate production-ready, AI assistant

Major Changes from UE 5.3 to UE 5.7

Breaking Changes

  • Substrate Material System: New material framework (replaces legacy materials)
  • PCG (Procedural Content Generation): Production-ready, major API changes
  • Megalights: New lighting system (millions of dynamic lights)
  • Animation Authoring: New rigging and animation tools
  • AI Assistant: In-editor AI guidance (experimental)

New Features (Post-Cutoff)

  • Megalights: Dynamic lighting at massive scale (millions of lights)
  • Substrate Materials: Production-ready modular material system
  • PCG Framework: Procedural world generation (production-ready in 5.7)
  • Enhanced Virtual Production: MetaHuman integration, deeper VP workflows
  • Animation Improvements: Better rigging, blending, procedural animation
  • AI Assistant: In-editor AI help (experimental)

Deprecated Systems

  • Legacy Material System: Migrate to Substrate for new projects
  • Old PCG API: Use new production-ready PCG API (5.7+)

Build Configuration (Verified)

  • BuildSettingsVersion: V6 (required — V5 triggers upgrade warnings about inline conformance and undefined identifiers)
  • IncludeOrderVersion: Latest
  • WindowsPlatform.bStrictInlineConformance: true (new V6 default)
  • UndefinedIdentifierWarningLevel: Error (new V6 default)
  • StructUtils module: Deprecated since 5.5 but still functional (GMCAbilitySystem depends on it)

Project Plugin Stack

  • GMCv2 v2.3.7 — Fab/Marketplace (prebuilt binaries)
  • GMCAbilitySystem v1.3 — Source plugin, compiled locally in project Plugins/
  • NarrativePro — Fab/Marketplace
  • WebUI — Fab/Marketplace (Chromium-based web rendering)
  • JsonLibrary — Fab/Marketplace (JSON for Blueprint)
  • BpGeneratorUltimate — Fab/Marketplace (MCP Blueprint bridge)

Verified Sources

  • Official docs: https://docs.unrealengine.com/5.7/
  • UE 5.7 release notes: https://dev.epicgames.com/documentation/en-us/unreal-engine/unreal-engine-5-7-release-notes
  • What's new in 5.7: https://dev.epicgames.com/documentation/en-us/unreal-engine/whats-new
  • UE 5.7 announcement: https://www.unrealengine.com/en-US/news/unreal-engine-5-7-is-now-available
  • UE 5.5 blog: https://www.unrealengine.com/en-US/blog/unreal-engine-5-5-is-now-available
  • Migration guides: https://docs.unrealengine.com/5.7/en-US/upgrading-projects/