Elon Musk reposted
SimWorld
@simworld_ai
Built from scratch by Grok 4.5 + Grok Build in UE5.8: a cyberpunk L-corner street with neon facades, rain, signs, and crowds walking through the scene.
End-to-end, the run took 10.75M tokens, 36.5 minutes, and only ~$12.4 at API pricing.
What impressed me most is not just the final render, but the process: the coding agent built it in many small steps, saved 30+ map checkpoints, verified the scene, and iteratively fixed issues autonomously.
Congrats to the @SpaceXAI team for building such an impressive coding model and harness. This feels like a real step toward agentic 3D world creation. @elonmusk @milichab @skcd42 @yunta_tsai
#UnrealEngine
09:21 PM · July 9, 2026 · 137.1K views
83
126
766