A web app
Sign in and play in your browser. Project Genie works this way but needs Ultra, an age of 18+ and a supported country. World Labs’ Marble is a web app with a free plan, and Odyssey links an experience you can try from its homepage.
Project Genie alternatives: world-model access options
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Project Genie needs a Google AI Ultra plan (from $99.99/month in the US), and Genie 4 is still invite-only. If that rules you out, these world models are open today. Some are web apps, one has a public API, and some are open source you can run yourself. We list what each one is, how to get it, and what it costs, using only official sources.
Three ways to use a world model today
A public API
Call the model from your own code. World Labs launched a public World API for Marble in January 2026. Odyssey’s homepage has a “Get API Access” link; check its conditions there. Genie 4 has no public API yet.
Open-source code
Download the model and run it yourself. Tencent’s HunyuanWorld 1.0 and Skywork’s Matrix-Game publish code and model weights on GitHub. You need your own hardware and some setup, and you should read each license.
Project Genie alternatives compared
Prices checked October 28, 2026. Marble’s pricing page shows dollar amounts without saying which currency or region, so we copy them as shown; its API is billed separately. Google AI Ultra is the US price in USD. Open-source models are free to download, but running them needs your own hardware.
| Product | Provider | What it is | Access | Published price | Developer route |
|---|---|---|---|---|---|
| Marble | World Labs | Generates navigable 3D environments | Marble web app and World API | $0 / $20 / $35 / $95 per month (app plans) | Public World API |
| HunyuanWorld 1.0 | Tencent | Text/image to explorable 3D worlds | Repository, model downloads and local setup | Free to download; no hosted price | Run locally; no hosted API listed |
| Matrix-Game 4.0 | Skywork AI | Game engine plus neural rendering | Repository, weights and browser-demo setup | Free to download; no hosted price | Run locally; no hosted API listed |
| Odyssey | Odyssey | Foundation world models | Web experience; API access link | Not listed on homepage | “Get API Access” link |
| Project Genie | Interactive world creation web app | Ultra plan, 18+, listed countries | From $99.99/mo (US) | No API; Genie 4 API not yet public |
The alternatives in detail
Marble — World Labs
Marble from World Labs generates explorable 3D worlds from text, images, panoramas, multiple views or video. You can render the result on the web or export it into other tools, and World Labs pitches it for design and creative work. The Marble app has a free plan and paid plans at $20, $35 and $95 per month. Developers can use the public World API, launched January 21, 2026, which generates worlds asynchronously and has its own API keys, billing and docs.
HunyuanWorld 1.0 — Tencent
HunyuanWorld 1.0 from Tencent generates explorable 3D worlds from text or an image. It builds each scene from a 360° panorama and can export it as a 3D mesh. Tencent publishes the code, model downloads and setup instructions on GitHub, so you can run it on your own machine. Its GitHub page does not list a hosted app or paid API. This entry covers version 1.0 specifically.
Matrix-Game 4.0 — Skywork AI
Matrix-Game is Skywork AI’s series of open-source interactive world models. Version 4.0 takes a different approach from Genie: a real game engine handles gameplay, physics and player input, and an AI video model turns simple low-poly frames into rich visuals. Skywork publishes the inference code, a browser demo and the game source on GitHub. Its GitHub page does not list a hosted app or paid API.
Odyssey — Odyssey
Odyssey builds foundation world models that, in its words, learn the physics, dynamics, cause-and-effect and human behaviors of the world. Its homepage links a “Try Odyssey-3” experience and a “Get API Access” page for developers. Pricing is not listed on the homepage, and we have not confirmed whether API access is open to everyone, so check the conditions on Odyssey’s developer site.
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How to choose
Know what you want out
These tools produce different things. Marble and HunyuanWorld give you a 3D scene you can export. Genie and Odyssey generate a live, interactive world. Matrix-Game pairs a game engine with AI visuals. Pick the one that matches the output you need.
App price is not API price
A monthly app plan covers using the provider’s app. APIs are usually billed separately; Marble says so on its pricing page. Open-source models are free to download, but you pay for the hardware to run them.
Why we do not rank them
We have not tested these models side by side, so we do not rank them or pick a winner. Everything here comes from each provider’s official pages. When a detail is not published, we say so instead of guessing.
FAQ
Is there a free version of Project Genie?
No. Project Genie requires a Google AI Ultra subscription. For a free option, Marble has a free plan, and HunyuanWorld and Matrix-Game are free to download and run yourself.
Does Project Genie already use Genie 4?
Not yet confirmed. It launched on Genie 3, and Google says Genie 4 is coming to Project Genie.
Can I use Project Genie outside the US?
In some countries, including the UK, Canada, Australia, Japan, South Korea and Singapore. You also need Ultra and must be 18 or older.
Which world models have a public API?
World Labs has a public World API for Marble. Odyssey has a “Get API Access” link for developers. HunyuanWorld and Matrix-Game are open source rather than hosted APIs. Genie 4 has no public API yet.
What do I get if I join the waitlist?
One email when the Genie 4 API opens, and nothing before that. It does not give you access to any of these products.
Get notified when the Genie 4 API opens.
One email when the API opens. Nothing before that.
No spam · Unsubscribe anytime Privacy