How Long Can One AI Video Generation Be? Limits by Model, Oct 2026
Single-generation length limits for Seedance 2.5, Wan 3.0, Kling 3, Veo 3.1, Gemini Omni and Luma Ray, with what to do when a shot needs more seconds.
The length of a clip you can get in one request varies by a factor of four across current models, and it decides whether a shot is one call or a stitching job. Below are the per-generation ceilings as the vendors and Sume's catalog state them on 2026-10-03.
One rule before the table: a limit on one generation is not a limit on a video. Several vendors offer extension, and Sume's Timeline can assemble clips afterward. The question is which approach keeps a shot continuous.
Per-generation limits
Sume's numbers come from its video catalog, listed through GET /v1/videos/models (docs). The vendor column comes from each vendor's own page.
| Model | Sume catalog | Vendor page says |
|---|---|---|
| Seedance 2.5 | 4 to 30 s | Up to 30 s per generation, with multi-round extensions |
| Wan 3.0 | 2 to 30 s | Runway's changelog lists WAN 3.0 up to 30 s (Aug 26) |
| Kling Video 3 | 4 to 15 s | Up to 15 s per generation |
| MiniMax H3 and H3 Max | 5 to 15 s | Runway lists H3 Max at 5 to 15 s (Sep 3) |
| Gemini Omni Flash 1.1 | 3 to 10 s | Extension in 3 to 10 s steps, up to 40 s total |
| Veo 3.1 | not in the catalog | 4, 6 or 8 s; extension in 7 s steps |
| Luma Ray 3.2 | not in the catalog | Text and image clips of 5 or 10 s |
Extension versus a longer first call
Google says Veo extension runs in 7-second steps, up to 20 times, at 720p only, and Omni extension reaches 40 seconds in total. Extension carries the previous clip forward, which helps continuity, but each step is another paid generation. A model that returns 30 seconds in one call, like seedance-2.5 or wan-3.0, avoids the seams when the shot is a single take.
Longer is not always better. Sume's Auto controls default to 8 seconds and accept 3 to 10, which fits the shots most ads actually use. Pin a long-clip model only when the shot itself runs long.
Decision rule
Match the shot to the ceiling: under 8 seconds, any model works and price decides. From 10 to 15 seconds, Kling 3, H3 and the Seedance 2.0 family fit in one call. Beyond 15 seconds in one take, choose seedance-2.5 or wan-3.0. For anything longer, generate in pieces and assemble with Timeline at $0.10 per output minute.
See also which model fits the inputs you have.
Sources
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