Seedance 2.5 First & Last Frame is the early-access preview build of the Seedance 2.5 family, generating a smooth video transition between a start and end image. This 4K variant is upscaled from the model's native 720p render (not a native 4K output) and supports clips up to 30 seconds. Upscaling to 4K costs more than the standard 720p tier.
About this model
Seedance 2.5 First & Last Frame is the early-access preview build of the Seedance 2.5 family, generating a smooth video transition between a start and end image. This 4K variant is upscaled from the model's native 720p render (not a native 4K output) and supports clips up to 30 seconds. Upscaling to 4K costs more than the standard 720p tier.
Cost analysis
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | Text prompt describing the transition and motion. | Create a smooth transition from a cloudy sky to a quiet riverside park path, with natural camera movement and realistic lighting. |
| First and Last Frame Images | array | Exactly 2 images: [first_frame, last_frame]. | https://samplelib.com/jpeg/sample-clouds-400x300.jpg |
| Duration | int | The duration of the generated video in seconds. | 5 |
| Aspect Ratio | Enum (7 options) | Aspect ratio of the output video. | 16:9 |
| Seed | int | Random seed for reproducible generation. Use -1 for random. | 42 |
Text prompt describing the transition and motion.
Create a smooth transition from a cloudy sky to a quiet riverside park path, with natural camera movement and realistic lighting.Exactly 2 images: [first_frame, last_frame].
https://samplelib.com/jpeg/sample-clouds-400x300.jpgThe duration of the generated video in seconds.
5Aspect ratio of the output video.
16:9Random seed for reproducible generation. Use -1 for random.
42Developer documentation
Frequently asked