SimWorld

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

[SimWorld @simworld_ai]

Missed Gemini 3 yesterday, but catching up now

This genuinely looks impressive!

[SimWorld @simworld_ai]

We asked 4 frontier coding agents to build the same Unreal 3D city scene in SimWorld Studio.

Same prompt. Different worlds 👀

Claude Code + Opus 4.7
Codex + GPT-5.5
Cursor + Composer 2.5
OpenCode + Gemini 2.5 Pro

Who wins?

[SimWorld @simworld_ai]

@GFunkyTheAnimal Yes. And We're adding more features to support building more complex games autonomously.

[SimWorld @simworld_ai]

Environment generation is the missing scaling axis for embodied AI.

Introducing SimWorld Studio: a self-evolving factory for endless interactive 3D env where agents act, fail & learn.

Env-agent co-evolvution improves navigation success 50% → 90%.

From a prompt, our SimCoder writes code to automatically build an interactive world. Agents train inside it. And their performance shapes the next world.

[SciTech Era @SciTechera]

Wow. That's cool.

Researchers just released World, an open-source Unreal Engine 5 simulator for training and testing LLM and VLM agents in realistic 3D environments.

The platform supports RGB, depth, and segmentation sensors, along with navigation, vehicles, pedestrians, robots and procedural city generation.

It's built with a Gym-like Python interface, it allows AI agents to learn physical and social reasoning in complex virtual worlds before real world deployment.

We're moving from AI that only understands information to AI that can perceive, reason and act inside realistic simulated environments.

[SimWorld @simworld_ai]

@SciTechera @Lianhuiq Thanks for sharing our work!🔥

Also check out the latest development on SimWorld Studio

[SimWorld @simworld_ai]

Environment generation is the missing scaling axis for embodied AI.

Introducing SimWorld Studio: a self-evolving factory for endless interactive 3D env where agents act, fail & learn.

Env-agent co-evolvution improves navigation success 50% → 90%.

From a prompt, our SimCoder writes code to automatically build an interactive world. Agents train inside it. And their performance shapes the next world.

[SimWorld @simworld_ai]

@m4zas24 SimWorld Studio is open-sourced. You can play locally. Checkout here https://t.co/LeE5dRLDe6

[SimWorld @simworld_ai]

We asked 4 frontier coding agents to build the same Unreal 3D city scene in SimWorld Studio.

Same prompt. Different worlds 👀

Claude Code + Opus 4.7
Codex + GPT-5.5
Cursor + Composer 2.5
OpenCode + Gemini 2.5 Pro

Who wins?

[SimWorld @simworld_ai]

@EHuanglu Nice Work! Also worth checking out SimWorld Studio:

https://t.co/0Nc2dUwyhd

[SimWorld @simworld_ai]

Environment generation is the missing scaling axis for embodied AI.

Introducing SimWorld Studio: a self-evolving factory for endless interactive 3D env where agents act, fail & learn.

Env-agent co-evolvution improves navigation success 50% → 90%.

From a prompt, our SimCoder writes code to automatically build an interactive world. Agents train inside it. And their performance shapes the next world.

[SimWorld @simworld_ai]

@tom_doerr @romeaugustus1 Let AI agents build whole Unreal Engine environments:)

[Lianhui Qin @Lianhuiq]

I’m not sure Gemini 3 looks that much more impressive here.🤔

For example, why is there a giant White House–like building just sitting in the middle of the street?

This feels like a real example of how even frontier coding agents can still struggle with spatial reasoning.

[SimWorld @simworld_ai]

@tom_doerr @romeaugustus1 Let AI agents build whole Unreal Engine environments:)

[SimWorld @simworld_ai]

Environment generation is the missing scaling axis for embodied AI.

Introducing SimWorld Studio: a self-evolving factory for endless interactive 3D env where agents act, fail & learn.

Env-agent co-evolvution improves navigation success 50% → 90%.

From a prompt, our SimCoder writes code to automatically build an interactive world. Agents train inside it. And their performance shapes the next world.

[SimWorld @simworld_ai]

https://t.co/Zta9BHsxKW

[SimWorld @simworld_ai]

Missed Gemini 3 yesterday, but catching up now

This genuinely looks impressive!

[SimWorld @simworld_ai]

Missed Gemini 3 yesterday, but catching up now

This genuinely looks impressive!

[SimWorld @simworld_ai]

@nexpoly Will try latest Gemini next :)

[SimWorld @simworld_ai]

@aiseomastery 🤣

[SimWorld @simworld_ai]

@AndryHTC Will try latest Gemini next :)

[SimWorld @simworld_ai]

@AInohogosya Will try latest Gemini next :)

[SimWorld @simworld_ai]

@Trigun420 Will try latest Gemini next :)

[SimWorld @simworld_ai]

@catocino_ Will try latest Gemini next :)

[SimWorld @simworld_ai]

@karyabangjumawa Great point! Will try it out

[Murray Kang @haoqik322]

Coding agents make such 3D generation a lot easier!

[SimWorld @simworld_ai]

We asked 4 frontier coding agents to build the same Unreal 3D city scene in SimWorld Studio.

Same prompt. Different worlds 👀

Claude Code + Opus 4.7
Codex + GPT-5.5
Cursor + Composer 2.5
OpenCode + Gemini 2.5 Pro

Who wins?