Atlas vs GWM Worlds 2: which world model should you use?

Verdict: these two models were announced two days apart and point in opposite directions. GWM Worlds 2 gives you a world you can walk into and hear, streamed at 720p as you steer it, and nothing leaves the session as a file. Atlas gives you a world you can export, a Gaussian splat or a minute of 1440p video along a camera path you specify, and you cannot steer it while it runs. Neither has a public API as of September 4, 2026. This is an independent comparison, not affiliated with World Labs or Runway.

What each model is for

GWM Worlds 2 is Runway’s General World Model, announced September 3, 2026. It is an autoregressive diffusion model that generates video and audio together, producing one continuous 720p stream at 24 frames per second with audio at 48,000 Hz, and it responds to your inputs while it runs (Runway). Runway describes it as the first world model that generalises to arbitrary actions rather than a fixed action set or navigation alone. It follows GWM-1, the company’s first world model, released in December 2025.

Atlas is World Labs’ omni world model, announced September 1, 2026. It generates image and video frames at up to 1440p and one minute with the camera path as an explicit input, reconstructs 3D scenes from as few as two or three photographs, and outputs point clouds and Gaussian splats (The Decoder). It is in early access for select partners (Implicator). Background is in what the Atlas world model is.

A stream versus a file

The useful way to separate these two is to ask what you are left holding when the run ends.

With GWM Worlds 2 you are left holding a recording, at best. The model generates the next frame conditioned on what you just did, so the world only exists while the session is alive. That is the price of interactivity, and it is the same trade Genie 3 makes. What you gain is a world that answers: tell a character to climb, and it climbs; tell the scene to change, and it changes.

With Atlas you are left holding geometry. Because it reconstructs an explicit 3D scene and renders along a known camera path, the output survives the session as a point cloud or splat file that opens in any viewer, including the free splat viewer on this site. What you lose is the ability to change your mind mid-generation.

Neither is better in general. The question is whether your pipeline consumes frames or assets.

Resolution, audio and session length

Atlas runs at up to 1440p because it generates offline and can spend as long as it needs on each frame. GWM Worlds 2 runs at 720p and 24 fps because every frame has to arrive before you notice a delay. The resolution gap is a direct consequence of the interactivity gap, not a quality judgement about either model.

Audio is the cleaner difference, and it is where GWM Worlds 2 pulls ahead of the other models compared on this site. It generates 48,000 Hz audio alongside the video, from the same foundational audio-visual model, so footsteps, voices and ambience come out of the same process that makes the picture (Runway on X). Neither Atlas’s nor Genie 3’s published material describes audio. If your use case is anything close to interactive entertainment, that single fact may decide the comparison.

Session length works differently on each side. Atlas produces up to one minute per generation and then stops. GWM Worlds 2 has no preset length: the world continues from each new input rather than following a fixed clip, so a session lasts as long as you keep steering it.

Camera and action control

Atlas takes a camera path as a native input, and World Labs describes the result as pixel-perfect camera control (World Labs on X). You specify the move, wait, and get exactly that move. It is precise and repeatable, which is what previs and product shots need.

GWM Worlds 2 splits control into two halves through a format Runway calls WorldPrompt. The persistent half is a genesis prompt that describes the environment, the subjects with their attributes and voices, and the behavioural laws of the world, gravity, collisions, camera perspective, anchored by a first frame for visual grounding. The changing half is what you do during the session: text actions addressed to any subject or to the scene itself, alongside continuous camera motion. Each step is conditioned on that global context, the current frame’s inputs, and a sliding window of the frames already generated. The mechanics are covered in more depth in the GWM Worlds 2 guide.

The contrast is between authoring a shot and directing a scene. Atlas is the camera operator’s tool; GWM Worlds 2 is the director’s.

3D outputs

Atlas outputs point clouds and Gaussian splat scenes that render on device. Those files import into engines and survive independently of the model that made them, which is what makes Atlas relevant to an asset pipeline at all.

GWM Worlds 2 outputs video and audio frames. There is no mesh, point cloud or splat export in the published material. If you need geometry, this is not a route to it, and the practical alternative from World Labs is Marble, which already has a live API; see Atlas vs Marble and the Marble API guide.

Access and pricing

Both are closed as of September 4, 2026. GWM Worlds 2 is a research preview with no self-serve access, no published pricing and no developer API; the launch page routes business enquiries through a contact form. Atlas is early access for select partners, also with no price and no API (Implicator).

That symmetry matters more than it looks. For anyone trying to ship something this quarter, the honest answer is that neither model is buildable yet, and among the models compared on this site the one with both a public API and a published price is Marble, at roughly $1.20 per world (Odyssey-2 also has a developer API; see world model APIs compared). Current numbers are on the pricing page, and the status of Atlas access is tracked on the Atlas API page.

Recommendations by use case

• Interactive entertainment and playable demos: GWM Worlds 2, decisively. It is the only one of the two with audio and live direction.
• Environments for Unity, Unreal or Blender: Atlas when it opens; Marble today, per the game development guide.
• Camera-controlled video, previs, product shots: Atlas. Repeatability is the whole requirement, and GWM Worlds 2 is not designed for it.
• Reconstructing a real place from photographs: Atlas. GWM Worlds 2 does not do reconstruction at all.
• Virtual characters and dialogue-driven scenes: GWM Worlds 2, because subjects carry voices and can be addressed directly.
• Training embodied agents: split. Use Atlas for faithful real-to-sim from captured footage, as in the robotics guide; use GWM Worlds 2 for volume and action diversity in generated environments.

Where the “arbitrary actions” claim matters

Runway’s strongest claim is not resolution, it is generality of action. Runway argues that previous interactive world models accepted a fixed vocabulary, usually movement, or navigation only. GWM Worlds 2 accepts text actions aimed at any subject or at the scene, which in principle covers gestures, object interaction, speech and sound as well as movement.

If that claim holds outside curated demos, it changes what an interactive world model is for. A fixed action set makes a playable environment; an open action set makes a simulator you can pose questions to. Nothing published so far measures how far the generalisation extends, and no third party has tested it, so treat it as a promising claim rather than a settled capability.

Atlas makes no equivalent claim, because it is not trying to be steered. Its generality is on the input side: text, images, video, depth and camera paths all enter the same model, discussed in Atlas benchmarks explained.

What to watch next

• A Runway developer API for GWM Worlds 2. The research preview says nothing about one. It would give Runway a buildable interactive world model, joining Odyssey, which already exposes a developer API for Odyssey-2.
• Atlas general availability and pricing. Still the biggest unknown on the World Labs side, tracked on the Atlas API page.
• Whether anyone adds 3D export to an interactive model. The lab that lets you walk into a world and then take it home closes the gap between these two categories.

Bottom line

Atlas and GWM Worlds 2 are not competitors so much as two answers to different questions. Do you want to be inside the world, or do you want to own it? GWM Worlds 2 is the model, among those compared here, that makes the first option sound and feel plausible. Atlas is the strongest current answer to the second. For the wider field, see the comparison hub and GWM Worlds 2 vs Genie 3. To hear when Atlas access widens, follow the changelog or its RSS feed.