A practical comparison of Sora 2, Veo 3.1, Kling 3.0, and Seedance 2.0. Compare prompt styles, audio handling, video length, and use cases to pick the right model.
AI video models are not interchangeable. Each has a distinct prompt personality, and the same scene rewritten for a different model produces noticeably different output. Understanding these differences before you start writing saves hours of trial and error.
Here is the high-level snapshot: Seedance 2.0 (ByteDance) excels at complex multi-shot narratives with a 9-element engineering prompt format. Kling 3.0 (Kuaishou) is the Chinese-language champion with native audio, strong physics, and Motion Brush for image-to-video. Sora 2 (OpenAI) delivers premium cinematic film look with Cameos and the best physics simulation. Veo 3.1 (Google DeepMind) is the undisputed audio king with multi-person dialogue, frame-accurate sound sync, and chained 148-second output.
Duration is a hard constraint for every AI video workflow. Veo 3 produces 8-second clips suitable for short ads, while Veo 3.1 extends to 60 seconds per clip with chained extensions reaching 148 seconds — the longest in the current market. Seedance 2.0 delivers 15-second segments that can be spliced into longer sequences. Kling 3.0 offers 15-second clips with smart shot decomposition extending up to 2 minutes. Sora 2 reaches 25 seconds on the Pro tier, plus 25-second extensions through the Storyboard feature.
For short social content and ads, any model works. For narrative filmmaking, Veo 3.1's chaining and Kling 3.0's multi-shot decomposition offer the most practical long-form paths.
Audio handling is where models diverge most sharply. Veo 3.1 is the clear leader: native multi-person dialogue, frame-precise sound sync, and layered audio (ambience + SFX + BGM + dialogue) in a single prompt. Kling 3.0 follows closely with native audio and character-directed voices — each character can speak different lines with distinct tones — a capability unique among Chinese models. Sora 2 supports native audio-visual sync with lip-sync mouth movement but generates simpler soundscapes. Seedance 2.0 requires separate audio processing outside the main generation pipeline.
If your project depends on spoken dialogue or precise sound design, Veo 3.1 or Kling 3.0 are the strongest options.
Seedance 2.0 uses a 9-element engineering format (Subject + Action + Scene + Camera + Lighting + Style + Audio + Quality Suffix + Constraints) with timestamped shot lists. Kling 3.0 provides three tiers: a 4-part basic formula for simple clips, a 5-layer advanced formula (Scene → Characters → Action → Camera → Audio & Style) for narratives, and motion-only prompts for image-to-video. Sora 2 offers two styles: a layered Shot List (Style / Cinematography / Actions / Sound) and an ultra-detailed parameterized format for film-industry control. Veo 3.1 follows an 8-element storyboard structure (Shot framing, Style, Lighting, Character, Location, Action, Dialogue, Audio) with separate audio layering.
For Chinese-language drama with native audio and multi-character dialogue, choose Kling 3.0. For English multi-person dialogue with precise sound sync, choose Veo 3.1. For premium cinematic film look with high-quality physics, choose Sora 2. For complex multi-shot narrative ads with flexible prompt control, choose Seedance 2.0. For image-to-video with strong physical interaction control, Kling 3.0 with Motion Brush is the best option.
Most professional workflows use at least two models. A common pattern: generate the base clip in one model, then use another model's image-to-video capability with the best output frame as the starting frame for further refinement.