> ## Documentation Index
> Fetch the complete documentation index at: https://docs.tess.im/llms.txt
> Use this file to discover all available pages before exploring further.

# Seedance 2.5 (Tool)

> Seedance 2.5 in Tess: clips up to 30 seconds with audio, image, video, and audio references, at 480p or 720p.

Seedance 2.5 is ByteDance's **joint audio-and-video** model in Tess. In one pass it produces a clip of up to **30 seconds**, with speech, music, and effects timed to the picture, at **480p** or **720p**.

| **Model** Seedance 2.5 | **Provider** ByteDance | **Input** Text, image, video, and audio | **Output** Video with audio |
| :- | :- | :- | :- |
| **Type** Video model | **Access in Tess** Chat · Video Generator | **Duration** 4–30 seconds | **Resolution** 480p or 720p |

> [!NOTE]
>
> Seedance 2.5 is a video model, not a conversational LLM. You use it in **Chat**, through the Video tool, and in the **Video Generator**.

## What 2.5 delivers in Tess

| Setting | In Tess |
| - | - |
| Duration | **4 to 30** seconds |
| Resolution | `480p` or `720p`. The default is `720p` |
| Aspect ratio | `16:9`, `4:3`, `1:1`, `3:4`, `9:16`, `21:9`, or `adaptive` |
| Audio | Generated with the video. You can ask for a silent clip |
| File | MP4 |
| Reference images | Up to 30 |
| Reference videos | Up to 10, 30 seconds combined |
| Reference audio | Up to 10, 30 seconds combined, with an image or a video |

With a first frame or with references, the aspect ratio used is `adaptive`: the tool follows the media.

## How to use it in Chat

**1. Open the video tool**

In Chat, open **Tools** and go to **Video**.

**2. Describe the clip**

Include the subject, action, setting, camera, duration, and aspect ratio. For speech, put the spoken line in quotes.

**3. Attach media, if you have any**

Use a first frame or references, and say in the prompt what each file is for: product, camera, dialogue, or score.

**4. Revise in the same conversation**

Ask for the change and state what must stay the same.

## How to use it in the Video Generator

In the left sidebar, open **Agent Studio** and then **Video Generator**. Write the prompt and set duration, aspect ratio, and resolution before you generate.

See [Video Generator](/en/video-gen.md).

> [!NOTE]
>
> In the interface, the tool is named **Seedance PRO**. Open that tool and choose **Seedance 2.5** from the available models.

> [!TIP]
>
> Include duration, aspect ratio, and resolution in the request. For example: **“Generate 12 seconds in 9:16, 720p, with audio.”**

## References

One generation accepts at most **30 images**, **10 videos**, and **10 audio files** (WAV or MP3). Reference videos and reference audio each add up to at most **30 seconds**. Reference audio needs at least one reference image or reference video. In the prompt, tag each file as `[Image1]`, `[Video1]`, `[Audio1]`.

First frame, and first plus last frame, are a separate path. The end image only works when the first frame is set. That path and the references **do not go in the same generation**. If the first and last frames have different aspect ratios, the last frame is cropped to the first.

> [!NOTE]
>
> A direct upload of reference images or videos that contain a **real person's face** is not accepted.

### First frame

```text theme={null}
12 seconds, 9:16, 720p, with audio.
Use the attached image as the first frame.
The person turns to the camera and says: "Today's report is ready."
Stable camera, office light, no subtitles and no logo.
```

### Product reference

```text theme={null}
8 seconds, 1:1, 720p, with audio.
[Image1] is the product. Do not change the label, color, or proportions.
[Video1] is camera only: a slow lateral track.
Graphite studio background, soft shadow, no text in the frame.
```

## Where Seedance 2.5 is most useful

* Reels and ads with a beginning, middle, and end in the same clip
* Scenes with several subjects, each with a role in the prompt
* A product or a style locked to a reference image
* A clip with speech, effects, and room tone in the same file

## Best practices

* Do not mix a first frame with reference images, videos, or audio.
* Keep reference videos and reference audio each within a combined 30 seconds.
* State what changes and what stays.
* Review hands, in-frame text, brands, and continuity before you publish.

Credit use depends on duration, resolution, and whether a reference video is attached. The current price is on [Models and Costs](/en/models-and-cost.md).

See also: [Video Generation](/en/videos.md) · [Video Generator](/en/video-gen.md) · [Seedance 2.5](https://seed.bytedance.com/en/seedance2_5).


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