Physics-accurate simulation
Objects fall correctly. Water splashes realistically. Cloth drapes on bodies. Sora 2 understands gravity, momentum, and material properties — motion that doesn't give the AI away.
Sora 2 World Simulation
AI world simulation generates video by modeling a 3D physical environment — gravity, material properties, object permanence, and light transport — rather than simply predicting the next frame of pixels. The model builds an internal representation of the scene's geometry and physics, so objects interact with weight, momentum, and surface friction that match real-world behavior. This approach produces motion and contact that look physically plausible without hand-authored animation or compositing.
What you can do
Object permanence and interaction
Characters pick up objects, put them down, and the world remembers. No objects appearing from nowhere or passing through walls. Sora 2 tracks entity state across the clip.
Photoreal lighting and materials
Skin pores, fabric weave, specular highlights on glass. Sora 2 sets the bar for texture fidelity — the detail that makes a shot feel filmed, not rendered.
Complex scene dynamics
Multiple characters interacting, vehicles in motion, weather effects, crowd scenes. Sora 2 handles scene complexity that breaks simpler models.
Fluid and particle systems
Pouring liquids, rising smoke, splashing rain, swirling dust. Sora 2 simulates volumetric phenomena with turbulence and dissipation that track real fluid dynamics — not looping stock overlays.
Contact and deformation response
A ball compresses on impact. A cushion dents under weight. Fabric stretches when pulled. Sora 2 models soft-body and rigid-body contact so surfaces react to force instead of staying static.
Get started
How to use
1
Open the video generator and select Sora 2
Go to Sunra Video and select Sora 2 from the model dropdown.
2
Describe the physical interaction explicitly
State the materials, weight, and movement in your prompt — for example: *A heavy glass marble rolls off a wooden table and shatters on a concrete floor.* The more specific your physics cues, the more accurate the simulation.
3
Mention environmental forces
Include gravity direction, wind, water currents, or other forces that affect the scene. For example: *Strong crosswind blows rain sideways across a narrow alley.* Sora 2 uses these cues to drive physically consistent motion.
4
Generate and verify physics accuracy
Click Generate and review the result. Check that objects fall at the right speed, liquids flow naturally, and collisions produce correct reactions. Regenerate with refined force descriptions if anything looks off.
5
Download or compare with other models in Canvas
Download the clip, or open it in Canvas to compare Sora 2's physics against other models side by side. Use the best result for your final cut.
Built for creators
Whether you're a solo creator, an agency, or a brand — every model adapts to how you work.
Copy & use
Prompt templates
Fluid pour
A ceramic jug slowly pours golden honey onto a stack of warm pancakes. The honey pools, spreads, and drips over the edges. Morning kitchen light, shallow depth of field. 16:9, 10 seconds.
Model: Sora 2 · Duration: 10s · Aspect: 16:9
Cloth drape
A silk sheet is tossed over a mannequin in a white studio. The fabric floats, settles, and clings to the form — wrinkles and folds catching soft directional light. Slow motion. 16:9, 8 seconds.
Model: Sora 2 · Duration: 8s · Aspect: 16:9
Object collision
A bowling ball rolls down a polished lane and strikes ten pins. Pins scatter, spin, and bounce off the back wall. Overhead tracking shot, arena lighting. 16:9, 6 seconds.
Model: Sora 2 · Duration: 6s · Aspect: 16:9
Weather and particle effects
A violent thunderstorm over a city skyline at night. Rain hammers the rooftops, lightning illuminates the clouds, and wind whips loose paper across an empty street. Cinematic wide shot. 16:9, 12 seconds.
Model: Sora 2 · Duration: 12s · Aspect: 16:9
Who it's for
Use cases
VFX pre-visualization
Test physics-heavy shots — explosions, collapses, water effects — before committing to a live shoot or expensive CG pipeline. Sora 2 gives directors a physically plausible previz in minutes instead of days.
Product interaction demos
Show liquid pouring into a glass, fabric draping over furniture, or an unboxing sequence with realistic weight and texture. Upload a product photo via image-to-video and let Sora 2 sell the tactile feel without a photo studio.
Architectural and environmental visualization
Visualize sunlight moving through a building, rain hitting a facade, or trees swaying in wind. Sora 2's physically grounded lighting and weather create architectural fly-throughs that feel real.
Educational and scientific simulations
Demonstrate gravity, fluid dynamics, optics, or material stress in a visual format students can watch and rewatch. Sora 2 produces physics-accurate motion that serves as a teaching aid rather than a rough approximation.
Compare
Sora 2 World Simulation vs Standard AI Video Models
| Sora 2 World Simulation | Standard AI Video Models | |
|---|---|---|
| Physics accuracy | Internal 3D world model enforces gravity, momentum, and contact — objects move with physical plausibility | Pattern-based generation — objects may float, clip through surfaces, or defy gravity |
| Object permanence | Entities persist across frames — picked-up objects stay held, occluded items reappear correctly | Objects can vanish, duplicate, or morph when temporarily hidden |
| Material fidelity | Distinct surface response per material — glass refracts, metal reflects, fabric folds, liquid flows | Generic surface treatment — materials often look similar regardless of type |
| Lighting realism | Physically based light transport — accurate shadows, caustics, specular highlights, and subsurface scattering | Approximate lighting — shadows may be inconsistent or absent |
| Scene complexity | Handles multi-object interactions, crowds, weather, and vehicles simultaneously | Quality degrades with more than a few interacting elements |
Get the best results
Tips & best practices
Describe materials explicitly
Name the material — glass, silk, water, brushed metal, wet concrete. Sora 2 adjusts reflection, weight, and deformation behavior per material. Vague descriptions like "shiny object" produce generic results.
Mention weight and forces for better physics
Include cues about mass and force — "a heavy iron ball", "a light feather caught in wind", "strong downward current". These hints help the world model select the right physics parameters for the interaction.
Start with simple interactions before complex scenes
A single object falling or one fluid pour will show you how Sora 2 handles physics at baseline. Once you're happy with the fundamentals, layer in multi-object collisions or environmental forces.
Use Sora 2 for physics-critical shots, faster models for everything else
Sora 2's world simulation is compute-heavy. Reserve it for shots where physics accuracy matters — product demos, VFX previz, scientific visualization. For talking heads or simple pans, a faster model like Kling 3.0 or Seedance 2.0 will save time and credits.
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FAQ
Questions & answers
What is world simulation in Sora 2?
World simulation means Sora 2 models a 3D understanding of the scene — physics, object relationships, lighting — rather than just generating pixel patterns. This produces more physically plausible and consistent video output.
How is Sora 2 physics different from other AI video models?
Most models learn visual patterns but don't enforce physical constraints. Sora 2's world model understands gravity, contact surfaces, and material properties, so objects interact realistically instead of floating or clipping through each other.
Is Sora 2 the most realistic AI video model?
For photoreal texture fidelity and physical accuracy, Sora 2 currently leads. Kling 3.0 is stronger at character consistency across cuts. Veo 3.1 offers more precise camera control. The best choice depends on your shot.
Do I need an OpenAI account to use Sora 2?
No. Sunra provides direct access to Sora 2 without a separate OpenAI account. Your Sunra credits work across all models.
What types of physics does Sora 2 simulate?
Gravity, rigid-body collisions, soft-body deformation, fluid dynamics (water, smoke, fire), cloth simulation, and physically based light transport. The model handles these as part of its internal world representation, not as separate post-processing effects.
How do I get better physics results from Sora 2?
Be explicit about materials (glass, silk, iron), forces (strong wind, gentle current), and weight (heavy, lightweight). The more physical detail in your prompt, the more accurately the world model configures the simulation.
Can Sora 2 handle multi-object interactions?
Yes. Sora 2 tracks multiple entities and their physical relationships — objects colliding, stacking, rolling off surfaces, or being carried by characters. Accuracy is highest with 2–5 interacting objects; very dense scenes may simplify some contact.
Is Sora 2 world simulation free to use?
Yes. Free daily credits cover Sora 2 generation including its world simulation capabilities. No separate feature charge. See pricing for subscription details.