How Sora Works
Sora is built on a diffusion transformer that operates on video patches rather than individual frames. OpenAI calls these "spacetime patches" — chunks of video compressed in both space and time that the model learns to denoise. This is meaningfully different from prior approaches (like Runway Gen-2) that operated frame-by-frame and struggled with temporal consistency.
The result is that objects in Sora-generated videos maintain their appearance across cuts. A red car stays red. A person's face remains coherent from shot to shot. Earlier models could not reliably do this.
Capabilities
- Resolution: up to 1080p
- Duration: up to 60 seconds (shorter clips generate faster)
- Aspect ratios: widescreen, portrait, square — the model handles any ratio natively without cropping
- Access: through ChatGPT Plus and ChatGPT Pro subscriptions at sora.com
Storyboard Mode
One of Sora's more practical features for creators is storyboard mode. Rather than generating a single long clip from one prompt, you set keyframes with individual prompts and Sora generates transitions between them. This gives you directorial control over scene progression without needing to stitch clips manually.
Remix and Blend
Remix lets you take an existing Sora video and change specific elements — swap the weather, change the time of day, alter clothing — while keeping the camera motion and scene composition intact.
Blend merges two videos together. The model identifies visual patterns from both inputs and creates a coherent interpolation between them. This is useful for style transfer between footage.
Current Limitations
Sora still makes characteristic errors that distinguish it from real footage:
- Physics violations: liquids occasionally pour upward or objects fall at wrong speeds
- Finger distortion: hands and fingers remain one of the hardest things for video diffusion models to generate correctly
- Long-range consistency: videos beyond 30 seconds can show object drift where props subtly change appearance
- Text in video: on-screen text is often garbled or incorrect
These are known research problems, not issues specific to Sora. They affect all current video generation models.
Comparison to Kling and HunyuanVideo
Kling 1.5 (Kuaishou) is the strongest competitor on motion realism. Its physics simulation is notably better than Sora's for water, hair, and cloth dynamics. It also offers a commercial API.
HunyuanVideo (Tencent) is open-source and can be run locally with enough VRAM (~80GB for full quality). For studios that need on-premise generation without sending content to a third party, HunyuanVideo is the current best open option.
Sora's advantage is the storyboard workflow, ease of use through the ChatGPT interface, and OpenAI's ongoing investment in safety filtering for commercial content.
Practical Use Cases for Creators
- Product advertisement mockups before commissioning a real shoot
- Social media short-form content (15–30 second clips)
- Concept visualization for pitches and presentations
- B-roll generation to supplement real footage
At the current access tier, Sora is most useful as a prototyping tool rather than a final delivery medium. The limitations in physics and finger rendering make it unsuitable for most contexts where viewers will scrutinize the footage closely.
