World Labs Marble Explained: 3D Worlds From Text or Images

World Labs Marble is a world model that turns a prompt or a photo into a 3D world you can walk through and export. Fei-Fei Li's company made it generally available on November 12, 2025. It opened a developer API in January 2026. In September 2026 World Labs agreed to join AMD. Below is what Marble exports and what the plans and API cost. The last section covers what the AMD deal means for anyone building on it.

What is World Labs Marble, in one sentence?

Marble is a multimodal world model from World Labs that generates persistent, editable 3D worlds from prompts or images and exports them as real 3D files.

Marble saves each world as a 3D file, so it persists after the model stops running. You can open the same file tomorrow in a game engine and it will look the same.

You use it at marble.worldlabs.ai. In its February 2026 funding post, which announced $1 billion in new funding, World Labs called these worlds spatially cohesive and persistent.

How does Marble differ from frame-based world models?

World Labs makes both kinds. Its research preview RTFM is a real-time frame model that renders each new view straight from the network.

RTFM keeps large worlds consistent by treating each past frame as a posed memory and pulling nearby frames into context. World Labs calls that "context juggling". The trade-off is that RTFM needs an H100 running the whole time you explore.

What can you do in Marble?

The launch post lists the inputs. A short text prompt or a single image (even an AI-generated one) can produce a whole world. Several photos of one place stitch into one world with transitions between views. Marble also accepts video and coarse 3D layouts.

After generation you can edit. Small edits remove an object. Larger ones swap objects or change the visual style. You can expand a selected region to add detail or fix artifacts, and you can compose several worlds into a bigger space. Per the Marble FAQ, you can share finished worlds by link and open them in a VR headset.

What is World Labs Chisel?

Chisel is Marble's experimental editing mode for advanced users. You block out the structure of a world with simple shapes or imported 3D assets. A text prompt then sets the look and can add elements the layout does not contain.

The launch post frames it as separating structure from style. One layout can produce a cyberpunk alley and a medieval street. For game and level designers this is the most practical part of Marble, because you place the walls and the prompt only sets the look.

How much does Marble cost?

The billing docs describe four self-serve tiers plus custom enterprise plans:

A basic world from one image costs 1,580 credits in the docs' example. Edits and expansions cost extra. Free users can generate but cannot export, per the export docs. Check the live pricing page before you buy, because the docs point there for current prices.

What file formats can you export from Marble?

Gaussian splats are the highest-fidelity output. Standard exports splats in the SPZ and PLY formats. It also exports panoramas and collider meshes. Pro adds textured meshes in GLB. The export docs link plugins for Unreal Engine, Unity, Blender and Houdini. For the web, World Labs maintains Spark, a library for rendering splats with three.js.

Game engines cannot use splats for physics, so Marble also exports a separate collider mesh.

How does the World Labs Marble API work?

World Labs announced the World API on January 21, 2026. It accepts the same kinds of input as the app, plus 360 panoramas. You buy credits on the World Labs Platform, and those credits are separate from Marble app credits.

The API quickstart shows the flow. You send a generate request with a model name and a world prompt. The call returns an operation that you poll until it is done, which takes about five minutes. The finished world includes SPZ splat files at several resolutions. It also comes with a GLB collider mesh and a panorama. The docs list two models, and the plus variant, marble-1.1-plus, makes larger worlds at a higher credit cost.

What happens to Marble now that World Labs is joining AMD?

On September 28, 2026, World Labs said it had signed a definitive agreement to join AMD. Fei-Fei Li is set to become AMD's chief scientist. Justin Johnson and Ben Mildenhall continue to lead the World Labs team inside AMD. The deal is expected to close by the end of 2026, subject to regulatory approval.

The announcement says nothing about Marble plans or the World API. Both were still running when we checked on October 28, 2026. World Labs also announced Atlas on September 1, 2026. Atlas is a new model in early access with select partners, and World Labs says it will power future versions of Marble.

What do World Labs' claims leave out?

Most of what is known about Marble comes from World Labs itself. The fidelity of splats versus meshes and the five-minute generation time are vendor statements. So is the promise that Atlas will power future versions. We found no independent benchmark of Marble's output quality. The FAQ does not list supported VR headsets, and the docs defer current prices to the live pricing page.

The bottom line

Try Marble on the free tier if you need 3D environments for previs or level blockouts. Pay for Standard only when you need exports, and for Pro when you need textured meshes or commercial rights. If you build on the World API, keep your pipeline loosely coupled. Nothing about the product is settled until the AMD deal closes.

How do you keep project knowledge when an agent builds on the World API?

If a coding agent writes your World API integration, it learns the fiddly parts as it goes. One is the API key header. Another is the scale metadata needed to render SPZ files outside Marble. The next session starts from zero. Switch from Claude Code to Codex and the same lessons get learned again.

memU keeps that knowledge as a shared wiki of readable Markdown. A scheduled background task slices each host's new session logs into jobs, and the agent distills them into memory and skill Markdown. memU's MemoryService makes no LLM or chat calls. It only stores and embeds what the agent wrote, then retrieves it later. A standing instruction in CLAUDE.md or AGENTS.md tells the agent to retrieve before answering. All supported hosts share one backend.

The hosted version is free and syncs across devices. Get an API key from memu.so, then send your agent one message:

Read https://memu.pro/SKILL.md, follow its instructions to install and configure memU, API Key is YOUR_MEMU_API_KEY.

The self-hosted install and the support matrix are in the memU GitHub repository.

FAQ

Is World Labs Marble free?

Yes, with limits. The free tier allows up to four world generations a month from simple inputs such as a text prompt. Exporting files requires a paid plan.

Who made Marble?

World Labs, the spatial intelligence company founded by Fei-Fei Li and three co-founders. In September 2026 it agreed to join AMD, with the deal expected to close by the end of 2026.

Can I use Marble worlds in Unreal or Unity?

Yes. Paid plans export Gaussian splats and collider meshes, and the docs link plugins for Unreal Engine and Unity. Pro adds textured GLB meshes.

Can I use Marble worlds commercially?

The billing docs list commercial rights to generated worlds as a Pro plan feature. Check the terms of service for the details before you ship a world in a paid product.

Can I view Marble worlds in VR?

Yes. Marble offers a VR link and a VR button that open a world in a headset. The FAQ does not list supported headsets.