GuideAugust 17, 2026developer3 sections

Open-source world model stacks: what you can actually inspect.

Use Tencent Hunyuan, Robbyant, Oasis, and NVIDIA Cosmos when the job is code, weights, papers, or evaluation, not a consumer editor.

Takeaways

Open means a repository, model card, or paper you can check, not a free creator app.
HY-World is generated and reconstructed 3D. LingBot is a multi-repo embodied stack. Cosmos is physical-AI infrastructure. Oasis is a demo with code links.
Runtime, GPU, and variant names are part of the claim. Do not copy FPS or engine-ready language from a README headline.

Open next

Tencent HunyuanTencent makes the open 3D asset track easier to follow.Ant Group / RobbyantRobbyant connects world models with maps and robot control.HY-World 2.0Reconstructs, generates, simulates persistent 3D worlds from text, images, video.LingBot-WorldRobbyant's open-source world simulator for high-fidelity, long-horizon, real-time interactive environments.

Tencent

HY-World 2.0 is the open 3D-world stack.

Start with the GitHub repository, Hugging Face card, and arXiv report. The May 2026 generation-code expansion is a dated event, not a permanent feature list.

HY-Embodied-0.5 is the sibling lane for embodied reasoning. Keep it off the world-generator scorecard.

Tencent Hunyuan profileGenerated-3D stack plus embodied lane.HY-World 2.0 dossierReconstruction, generation, and simulation materials.

Ant Group

Robbyant is four repos with four jobs.

LingBot-World for interactive simulation. LingBot-Map for streaming reconstruction. LingBot-VA for video-action robot control. LingBot-VLA for instruction-following manipulation.

The Robbyant GitHub organization is the index. A single clone is not the whole stack, and a mobile-app report is not local inference.

Ant Group / Robbyant profileHow the LingBot family is labeled.

NVIDIA and Oasis

Infrastructure and demos are open in different ways.

NVIDIA Cosmos publishes a GitHub organization around world foundation models for physical AI. That is open infrastructure, not a scene editor.

Oasis publishes a project page with demo, code, and weight links. That is an inspectable research demo, not a production runtime.

NVIDIA profileCosmos as physical-AI infrastructure.Oasis dossierPublic demo with code and weights.

FAQ

Is an open stack a Marble alternative?

Only for readers who need inspectable code and weights. It is not an alternative if the job is a hosted editor, account workflow, or shareable world product.

Decision tables

Use a comparison when two lanes are still competing.

HY-World 2.0 vs MarbleOpen 3D world stack, or polished persistent-world product workflow?HappyOyster vs LingBot-WorldEarly-access creation product or open-source simulator stack?Cosmos vs General World ModelsPhysical-AI infrastructure, or the broader creator and interactive-world category?

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