# Seedance 2.5
Seedance 2.5 in Sloosh: ByteDance video of 4 to 30 seconds at up to 1080p, with 30 image and 10 video references, timed beats and sound.
Last updated: 2026-10-05
**Key facts**
- Seedance 2.5 is ByteDance's video model for longer stories, and in Sloosh it makes clips of 4 to 30 seconds at 480p, 720p or 1080p.
- Seedance 2.5 takes up to 30 reference images and 10 reference videos in Sloosh, each video 2 to 30 seconds long.
- Seedance 2.5 follows timed beats written in whole seconds, such as `0-3s:` and `3-7s:`; Seedance 2.0 follows numbered shots instead.
- Seedance 2.5 makes sound by default in Sloosh, including dialogue in more than 10 languages, and the sound can be switched off.
- Seedance 2.5 is the default video model in Sloosh Studio and accepts prompts of up to 30,000 characters.
Web page: https://sloosh.ai/docs/seedance-2-5
Seedance 2.5 is ByteDance's model for longer stories: up to 30 seconds in one clip, with up to 30 image and 10 video references, timed beats and dialogue in more than 10 languages.
## When to use it
- Longer ads and stories that need several beats in one clip.
- Keeping a product or character consistent from references.
- It looks noticeably different from [Seedance 2.0](https://sloosh.ai/docs/seedance-2-0.md); the same prompt gives a different style.
## How to prompt it
- Start by naming each reference by order and job: "Image 1 is the amber serum bottle; keep its label exactly."
- Then one sentence: subject, place, event, style and camera.
- Then the plot in timed beats, such as `0-3s:` and `3-7s:`, in whole seconds with no gaps. Give each beat its visuals, camera, action and sound.
- Put sound effects in angle brackets, ``, and dialogue in quotes.
- Negatives work for subtitles and audio: "No subtitles.", "No music."
- Don't change the camera every second or cram many actions into one beat.
## Example
One product reference and three timed beats.
Input: product photo: 
->
Result: [](https://sloosh.ai/docs/m-seedance-2-5.mp4) (video)
_16:9, 720p, 10 seconds, sound on, Enhance off. Clips here play without sound; press one to pause._
**Prompt**
```text
Image 1 is the amber serum bottle; keep its shape, black dropper and "SERUM 01" label exactly.
A calm, realistic skincare ad: the bottle on a white marble bathroom counter at sunrise.
0-3s: Wide shot, soft morning light through a window; the bottle stands beside a folded white towel.
3-7s: A hand lifts the dropper; one golden drop falls in slow motion back into the bottle. The camera pushes in slowly to a close-up of the label.
7-10s: The hand sets the dropper back; the camera holds on the bottle in warm light.
Gentle bathroom ambience, light piano music. No subtitles, no logo, no watermark.
```
## Settings in Sloosh
- Aspect ratio: Auto, 21:9, 16:9, 4:3, 1:1, 3:4 or 9:16.
- Resolution: 480p, 720p or 1080p.
- Length: 4 to 30 seconds.
- References: up to 30 images and 10 videos (each 2 to 30 seconds).
- Start and end frames: both optional.
- A start or end frame can't be combined with reference images.
- Sound: on by default; you can turn it off, which can change the price.
- Prompt: up to 30,000 characters.
Open it in [Video](https://sloosh.ai/studio/video) and pick Seedance 2.5 in the model chip. The Generate button shows the cost first.
## Frequently asked questions
### How long can a Seedance 2.5 video be in Sloosh?
A Seedance 2.5 video in Sloosh can be any whole number of seconds from 4 to 30, the longest single clip of any video model in Sloosh. Your plan also caps video length, so check the length chip and [Pricing](https://sloosh.ai/pricing) if 30 seconds isn't offered.
### Seedance 2.5 vs Seedance 2.0: which should I use?
Use Seedance 2.5 for clips over 15 seconds, timed beats and many references (30 images, 10 videos). Use [Seedance 2.0](https://sloosh.ai/docs/seedance-2-0.md) for 4K output or a look you already like: BytePlus warns the same prompt gives a visibly different style on 2.5, and 2.0 ignores timestamps in favour of numbered shots.
### How do I write a multi-shot prompt for Seedance 2.5?
Write the plot as timed beats in whole seconds with no gaps, such as `0-3s:`, `3-7s:` and `7-10s:`, and give each beat its visuals, camera, action and sound. BytePlus warns that packing too many actions into one beat causes extra cuts or skipped plot.
### How do I add dialogue and sound effects in Seedance 2.5?
Put dialogue in quotes and sound effects in angle brackets, such as ``. Seedance 2.5 speaks more than 10 languages. To control the soundtrack, add plain negatives like "No music." or "No subtitles."; BytePlus says these negatives work for audio and subtitles.
### How do I get correct on-screen text in a Seedance 2.5 video?
Spell the words letter by letter in the prompt, or add the text as an image reference. BytePlus lists misspelled on-screen text as a known Seedance 2.5 issue, and these are the two fixes its prompt guide gives.
### Can I use a start frame and reference images together in Seedance 2.5?
No. In Sloosh a Seedance 2.5 start or end frame can't be combined with reference images, and Studio closes the other option once you add one. Pick frames to fix how the clip opens and ends, or references to keep a product or character consistent.
## Sources
- [BytePlus: Seedance 2.5 prompt guide](https://docs.byteplus.com/en/docs/modelark/seedance-2-5-prompt-guide)
- [BytePlus: Seedance 2.5 tutorial](https://docs.byteplus.com/en/docs/modelark/seedance-2-5)
- [BytePlus: better Seedance 2.5 prompts](https://ai.byteplus.com/resources/how-to-write-better-seedance-2-5-prompts)