SimWorld

@simworld_ai

Open-source initiative for open-ended realistic simulation of autonomous agents in physical and social worlds

simworld.org

Joined January 2026

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SimWorld
@simworld_ai
Jul 17
@Kimi_Moonshot K3 launched yesterday—so we put it straight into SimWorld against Claude Fable 5 and GPT‑5.6 Sol. Same brief: build + populate a cyberpunk L-street. Score / API-equivalent cost: K3 93.2 / $13 Fable 99.4 / $99 Sol 80.6 / $10 Videos: K3 → Fable →
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SimWorld
@simworld_ai
Jul 17
Article
Kimi K3 vs. Claude Fable 5 vs. GPT-5.6 Sol: Building the Same Cyberpunk World in SimWorld
Kimi K3 launched on July 16. Within hours, we put it through a long-horizon 3D task against Claude Fable 5 and GPT-5.6 Sol: build and populate the same cyberpunk L-street in SimWorld (on top of Unreal...
SimWorld
@simworld_ai
Jul 9
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
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SimWorld
@simworld_ai
Jun 17
Wow — GLM-5.2 is really strong on this environment-gen task. @Zai_org Among all models so far, it has the best building placement: almost no floating or overlapping buildings, and the village feels much more grounded. Only caveat: it forgot to delete 2 early test assets from
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SimWorld
@simworld_ai
Jun 9
Update: also tried the same prompt with Fable 5 First impression: visually the strongest result so far --- denser village, better terrain/building placement, and nice lived-in details. Still not perfect though: close-ups show both good details and failure cases, including
SimWorld
@simworld_ai
Jun 9
Update: also tried the same prompt with Fable 5 First impression: visually the strongest result so far --- denser village, better terrain/building placement, and nice lived-in details. Still not perfect though: close-ups show both good details and failure cases, including
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SimWorld
@simworld_ai
Jun 8
We gave 4 frontier coding agents the same hard environment-gen test: Preserve the desert landscape. Surgically remove only the ruins. Then build a dense, believable Middle Eastern village from scratch using rustic assets. Which model did the best job? 🏜️👇 Poll and full