Almost every video model has a short ceiling, and the reason is structural: the model has to hold the whole sequence in mind at once to keep it coherent, and that requirement grows with length. So the options are a menu, not a slider — a model offers a handful of lengths and refuses the rest.
Length also changes what a prompt should contain. A short clip is one beat: one action, one camera behaviour. Ask for a three-part narrative in a few seconds and the model compresses it into something that reads as a jump cut or, more often, into a single muddled action.
For anything longer than the ceiling, the answers are extension — continuing from the last frame — or assembly, generating several shots and cutting them together. Assembly is usually the better-looking route because a cut hides discontinuity that an extension has to survive.
In practice
- Fixed options are common; a model advertising 5s and 10s will not give you 7s.
- One clip, one beat. Multi-beat ideas want multiple generations.
- Duration is the main driver of what a video job costs in credits on most models.
Clip lengths on offer
The per-generation lengths models expose as a fixed choice rather than a free number. 173 of the 385 models in the Versely catalog qualify.
| Model | Provider | Type |
|---|---|---|
| HeyGen Video | HeyGen | Video |
| Wan 3.0 Text to Video | Wan | Video |
| Minimax H3 Text to Video | MiniMax | Video |
| Seedance 2.5 | ByteDance | Video |
| Flux 3 Text to Video | Black Forest Labs | Video |
| Seedance 2.0 | ByteDance | Video |
| Grok Imagine Video 1.5 Text to Video | Grok | Video |
| Happy Horse 1.1 Image to Video | Alibaba | Video |
Browse all 78 spec pages for full settings, resolutions and credit costs.
The mistake to avoid
Planning a thirty-second story as one generation. Storyboard it as shots first, then generate each one.
Where you will run into it
- Extend a Video's Length — Your clip ends too soon. Keep it going.
- Trim a Video — Keep the part you want. Drop the rest.
- AI Video Generator — Text-to-video, image-to-video, and story chaining in one studio.
- The Secret of the Golden Grain — A cinematic 6-scene mystery about a Skeleton Pharaoh discovering the secret wealth of Egypt — a holy golden grain — and escaping via the Nile. Features high consistency and engagement hooks.
Related terms
Video extend
Video extend continues an existing clip past its final frame, generating new footage that starts from where the old footage stopped.
Frame rate
Frame rate is how many still frames make up one second of video, written as fps — 24 for a filmic look, 30 for broadcast-standard motion, 60 for smooth fast action.
Temporal consistency
Temporal consistency means staying stable over time; in video, each frame agrees with the one before, so nothing flickers, shimmers or drifts as it plays.
Resolution
Resolution is how many pixels an output contains, usually named by its height — 720p, 1080p, 4K — and set before generation rather than after.
Seed
Seed meaning: the number that sets the random starting noise so the same seed and settings can reproduce the same output.
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