Meet Seedance 2.5
Seedance 2.5 is the long-form member of the Seedance family. Where most video models stop at 10 or 15 seconds, it holds one coherent shot for up to 30, with dialogue, ambience and sound effects generated alongside the picture.
It takes the same inputs as Seedance 2.0: a prompt on its own, a start frame (with an optional end frame), or reference images of your product or presenter. When you animate a still, the still sets the frame, so the aspect ratio follows your image.
Available in Advibly
Settings and estimated costs from Advibly's live model configuration.
- Inputs
- Text, Start frame, End frame, Up to 4 reference images
- Durations
- 4s to 30s
- Aspect ratios
- 9:16, 16:9, 4:3, 3:4, 1:1, 21:9
- Output options
- 480p, 720p
- Audio
- Generated with the video
- Estimated cost
- $0.17 to $0.35 / secondOne credit costs $1. The range spans the cheapest and the most expensive settings this model offers; the composer shows the exact amount before you generate.0.17 to 0.35 credits / second
When to use it
Use Seedance 2.5 when a cut would break the moment and you need the whole thing in one take.
- Single-take testimonials and walk-and-talks
- Longer product demonstrations without stitching clips
- Ambient scenes with sound for social backgrounds
Things to keep in mind
Output tops out at 720p. For 1080p, use Seedance 2.0 Pro and stitch shorter clips.
In image-to-video the aspect ratio comes from your start frame, so crop the image first.
Get more from your prompt
- 1.Write the shot as a sequence of beats with rough timings, since you have up to 30 seconds to fill.
- 2.Put spoken lines in quotes and say who speaks them.
- 3.Name the ambience and sound effects you want to hear.
- 4.Keep one location and one lighting setup across the whole take.
Common questions
What is Seedance 2.5 best used for?
Seedance 2.5 is particularly useful for single-take testimonials and walk-and-talks, longer product demonstrations without stitching clips, ambient scenes with sound for social backgrounds. The right choice still depends on your input assets, delivery format, turnaround and credit budget.
What inputs does Seedance 2.5 support in Advibly?
Seedance 2.5 works from text, start frame, end frame and up to 4 reference images. Advibly only shows the controls a model actually supports once it is selected, so you are never offered a combination it cannot render.
How many credits does Seedance 2.5 use?
The current estimate is 0.17 to 0.35 credits / second ($0.17 to $0.35 / second, at $1 per credit). The exact amount follows the options you pick, and Advibly shows it on the generate button before anything is charged.
Reviewed September 29, 2026 against Advibly's model configuration and ByteDance's published material.
Developer source
