# Seedance 2.5 API Documentation

> Generate videos with the Seedance 2.5 model through the AI Studio API.

## Overview

Use the AI Studio API to create Seedance 2.5 generation tasks and query their status. The flow is asynchronous: create a task first, then poll the task endpoint with the returned `taskId`.

## Authentication

All requests require an API key in the `Authorization` header.

```http
Authorization: Bearer YOUR_API_KEY
```

## Available models

| modelId | Version | Provider | Runtime model |
| --- | --- | --- | --- |
| `video:fal-bytedance-seedance-2-5-text-to-video` | Text to Video | ByteDance | bytedance/seedance-2.5/text-to-video |
| `video:fal-bytedance-seedance-2-5-image-to-video` | Image to Video | ByteDance | bytedance/seedance-2.5/image-to-video |
| `video:fal-bytedance-seedance-2-5-reference-to-video` | Reference to Video | ByteDance | bytedance/seedance-2.5/reference-to-video |
| `video:bytedance-seedance-2-5` | Seedance 2.5 | Bytedance Seedance 2.5 | bytedance/seedance-2-5 |

## 1. Create generation task

### Endpoint

```http
POST https://localhost:3000/api/ai-studio/execute
Content-Type: application/json
Authorization: Bearer YOUR_API_KEY
```

### Request example

```json
{
  "modelId": "video:fal-bytedance-seedance-2-5-text-to-video",
  "isPublic": true,
  "payload": {
    "generate_audio": true,
    "resolution": "720p",
    "duration": "auto",
    "prompt": "An octopus finds a football in the ocean and excitedly calls its octopus friends to come and play. Cut scene to an octopus football game under the sea.",
    "end_user_id": "",
    "bitrate_mode": "standard",
    "aspect_ratio": "auto"
  }
}
```

### Success response

```json
{
  "success": true,
  "data": {
    "modelId": "video:fal-bytedance-seedance-2-5-text-to-video",
    "generationId": "generation-id",
    "reservedCredits": 20,
    "taskId": "provider-task-id",
    "state": "queued"
  }
}
```

## 2. Query task status

### Endpoint

```http
GET https://localhost:3000/api/ai-studio/tasks/{taskId}
Authorization: Bearer YOUR_API_KEY
```

### Success response

```json
{
  "success": true,
  "data": {
    "generationId": "generation-id",
    "taskId": "provider-task-id",
    "modelId": "video:fal-bytedance-seedance-2-5-text-to-video",
    "state": "succeeded",
    "mediaUrls": [
      "https://example.com/result.mp4"
    ],
    "reservedCredits": 20,
    "refundedCredits": 0
  }
}
```

## Request fields

### Text to Video

#### Payload fields

| Field | Type | Required | Default / Example | Options | Description |
| --- | --- | --- | --- | --- | --- |
| `generate_audio` | boolean | No | `true` | - | Whether to generate synchronized audio for the video, including sound effects, ambient sounds, and lip-synced speech. The cost of video generation is the same regardless of whether audio is generated or not. |
| `resolution` | enum | No | `"720p"` | 480p, 720p, 1080p | Video resolution - 480p for faster generation, 720p for balance, 1080p for high quality. |
| `duration` | enum | No | `"auto"` | auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 | Duration of the video in seconds. Supports 4 to 30 seconds, or auto to let the model decide based on the prompt. |
| `prompt` | string | Yes | `"An octopus finds a football in the ocean and excitedly calls its octopus friends to come and play. Cut scene to an octopus football game under the sea."` | - | The text prompt used to generate the video |
| `end_user_id` | object | No | `-` | - | The unique user ID of the end user. |
| `bitrate_mode` | enum | No | `"standard"` | standard, high | Output bitrate mode. 'high' requests a higher-quality, larger-file encode from the model; 'standard' uses the default bitrate. |
| `aspect_ratio` | enum | No | `"auto"` | auto, 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 | The aspect ratio of the generated video. Use 16:9 for landscape, 9:16 for portrait/vertical, 1:1 for square, 21:9 for ultrawide cinematic, or auto to let the model decide. |

#### Input fields

_No fields are configured for this model._

### Image to Video

#### Payload fields

| Field | Type | Required | Default / Example | Options | Description |
| --- | --- | --- | --- | --- | --- |
| `duration` | enum | No | `"auto"` | auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 | Duration of the video in seconds. Supports 4 to 30 seconds, or auto to let the model decide based on the prompt. |
| `prompt` | string | Yes | `"An octopus finds a football in the ocean and excitedly calls its octopus friends to come and play. Cut scene to an octopus football game under the sea."` | - | The text prompt describing the desired motion and action for the video. |
| `generate_audio` | boolean | No | `true` | - | Whether to generate synchronized audio for the video, including sound effects, ambient sounds, and lip-synced speech. The cost of video generation is the same regardless of whether audio is generated or not. |
| `image_url` | string | Yes | `"https://v3b.fal.media/files/b/0a8eba37/Cqg-4Uwzyz4DELfceT1CF_a17e588773ec45b1a9e6f100a787b80b.jpg"` | - | The URL of the starting frame image to animate. Supported formats: JPEG, PNG, WebP. Max 30 MB. |
| `resolution` | enum | No | `"720p"` | 480p, 720p, 1080p | Video resolution - 480p for faster generation, 720p for balance, 1080p for high quality. |
| `end_image_url` | object | No | `-` | - | The URL of the image to use as the last frame of the video. When provided, the generated video will transition from the starting image to this ending image. Supported formats: JPEG, PNG, WebP. Max 30 MB. |
| `end_user_id` | object | No | `-` | - | The unique user ID of the end user. |
| `bitrate_mode` | enum | No | `"standard"` | standard, high | Output bitrate mode. 'high' requests a higher-quality, larger-file encode from the model; 'standard' uses the default bitrate. |
| `aspect_ratio` | string | No | `"auto"` | - | The aspect ratio of the generated video. Always "auto" for image-to-video |

#### Input fields

_No fields are configured for this model._

### Reference to Video

#### Payload fields

| Field | Type | Required | Default / Example | Options | Description |
| --- | --- | --- | --- | --- | --- |
| `task` | enum | No | `"reference"` | reference, editing, extension | The type of video generation task. Reference uses the supplied media as guidance. Editing modifies a reference video and automatically coerces aspect_ratio and duration to auto. Extension continues a reference video and automatically coerces aspect_ratio to auto. |
| `bitrate_mode` | enum | No | `"standard"` | standard, high | Output bitrate mode. 'high' requests a higher-quality, larger-file encode from the model; 'standard' uses the default bitrate. |
| `duration` | enum | No | `"auto"` | auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 | Duration of the video in seconds. Supports 4 to 30 seconds, or auto to let the model decide based on the prompt. |
| `prompt` | string | Yes | `"An octopus finds a football in the ocean and excitedly calls its octopus friends to come and play. Cut scene to an octopus football game under the sea."` | - | The text prompt used to generate the video. |
| `video_urls` | string[] | No | `-` | - | Reference videos to guide video generation. Refer to them in the prompt as @Video1, @Video2, etc. Supported formats: MP4, MOV. Up to 10 videos. Each video must be 1.8 to 30.2 seconds and no larger than 200 MB; combined duration must not exceed 30.2 seconds. Dimensions must be 300 to 6,000 pixels per side, aspect ratio 0.4 to 2.5, and frame rate 24 to 60 FPS. |
| `generate_audio` | boolean | No | `true` | - | Whether to generate synchronized audio for the video, including sound effects, ambient sounds, and lip-synced speech. The cost of video generation is the same regardless of whether audio is generated or not. |
| `audio_urls` | string[] | No | `-` | - | Reference audio to guide video generation. Refer to them in the prompt as @Audio1, @Audio2, etc. Supported formats: MP3, WAV. Up to 10 files. Each file must be 1.8 to 30.2 seconds and no larger than 15 MB; combined duration must not exceed 30.2 seconds. At least one reference image or video is required. |
| `resolution` | enum | No | `"720p"` | 480p, 720p, 1080p | Video resolution - 480p for faster generation, 720p for balance, 1080p for high quality. |
| `seed` | object | No | `-` | - | Random seed for reproducibility. Note that results may still vary slightly even with the same seed. |
| `end_user_id` | object | No | `-` | - | The unique user ID of the end user. |
| `image_urls` | string[] | No | `["https://v3b.fal.media/files/b/0a8eba37/Cqg-4Uwzyz4DELfceT1CF_a17e588773ec45b1a9e6f100a787b80b.jpg"]` | - | Reference images to guide video generation. Refer to them in the prompt as @Image1, @Image2, etc. Supported formats: JPG, PNG, WebP, BMP, TIFF, GIF, HEIC, HEIF. Max 30 MB per image. Up to 30 images. Total files across all modalities must not exceed 50. |
| `aspect_ratio` | enum | No | `"auto"` | auto, 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 | The aspect ratio of the generated video. Use 16:9 for landscape, 9:16 for portrait/vertical, 1:1 for square, 21:9 for ultrawide cinematic, or auto to let the model decide. |

#### Input fields

_No fields are configured for this model._

### Seedance 2.5

#### Payload fields

| Field | Type | Required | Default / Example | Options | Description |
| --- | --- | --- | --- | --- | --- |
| `model` | enum | Yes | `"bytedance/seedance-2-5"` | bytedance/seedance-2-5 | The model name to use for generation. Required field. - Must be `bytedance/seedance-2-5` for this endpoint |
| `input` | object | Yes | `-` | - | Input parameters for the generation task |

#### Input fields

| Field | Type | Required | Default / Example | Options | Description |
| --- | --- | --- | --- | --- | --- |
| `prompt` | string | No | `"A serene beach at sunset with waves gently crashing on the shore, palm trees swaying in the breeze, and seagulls flying across the orange sky"` | - | The text prompt used to generate the video.. ( Max length: 30000 characters) |
| `first_frame_url` | string | No | `-` | - | First frame image url or asset://{assetId} (for example: asset://asset-20260404242101-76djj)<br>Cannot be used simultaneously with reference_image_urls, reference_video_urls, or reference_audio_urls. |
| `last_frame_url` | string | No | `-` | - | End frame image url or asset://{assetId} (for example: asset://asset-20260404242101-76djj)<br>last_frame_url cannot be passed alone; first_frame_url must be provided together with it. |
| `reference_image_urls` | string[] | No | `["https://file.aiquickdraw.com/custom-page/akr/section-images/example1.png"]` | - | Enter a list of image URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj).<br>Single image requirements:<br>Format: jpeg, png, webp, bmp, tiff, gif.<br>Aspect ratio (width/height): (0.4, 2.5)<br>Width and height (px): (300, 6000)<br>Size: Single image less than 30 MB.<br>Maximum number of files: The sum of the number of frames at the beginning and end must not exceed 30.<br>Mutually exclusive with the first/last-frame scenario; |
| `reference_video_urls` | string[] | No | `-` | - | Enter a list of video URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj) .<br>Single video requirements:<br>Video format: mp4, mov.<br>Resolution: 480p, 720p<br>Dimensions:<br>Aspect ratio (width/height): [0.4, 2.5]<br>Width/height (px): [300, 6000]<br>Total pixels: [640×640=409600, 834×1112=927408], i.e., the product of width and height must meet the range requirement of [409600, 927408].<br>Size: Single video not exceeding 200 MB.<br>Frame rate (FPS): [24, 60]<br>Single video duration: [2, 30] seconds; Mutually exclusive with the first/last-frame scenario; Total duration of reference videos must not exceed 30 seconds. |
| `reference_audio_urls` | string[] | No | `-` | - | Enter a list of audio URLs or asset://{assetId} (for example: asset://asset-20260404242101-76djj) .<br>Single audio requirements:<br>Format: wav, mp3<br>Size: Single audio file size not exceeding 15 MB.<br>Single audio duration: [2, 30] seconds; Mutually exclusive with the first/last-frame scenario; Total duration of reference videos must not exceed 30 seconds. |
| `return_last_frame` | boolean | No | `false` | - | Whether to return the last frame of the video. When draft=true, this parameter cannot be set to true. |
| `generate_audio` | boolean | No | `true` | - | Whether to generate audio for the video. - **true**: Generate with audio (higher cost)<br>- **false**: Generate without audio Note: Enabling audio will increase the generation cost |
| `resolution` | enum | No | `"720p"` | 480p, 720p, 1080p | Video resolution - 480p for faster generation, 720p for balance. |
| `aspect_ratio` | enum | No | `"adaptive"` | 1:1, 4:3, 3:4, 16:9, 9:16, 21:9, adaptive | Video aspect ratio configuration. |
| `duration` | number | No | `5` | - | Video duration in seconds, from 4 to 30. |
| `output_format` | enum | No | `"mp4"` | mp4, mov | Video output format. |
| `web_search` | boolean | No | `-` | - | Enable online search. |
| `nsfw_checker` | boolean | No | `-` | - | Defaults to false. You can set it to false based on your needs. If set to false, our content filtering will be disabled, and all results will be returned directly by the model itself.<br>Note: There is no guarantee that everything can be filtered out; if you are not satisfied with the results, you will need to make your own arrangements. |

## Pricing

Credits are reserved when a generation task is created. The `reservedCredits` value in the create-task response is the final amount reserved for that request.

| Model | Type | Spec | Price | Billing |
| --- | --- | --- | --- | --- |
| Text to Video | Text to Video | 480p | 44.1 credits/s | Output seconds × 44.1 |
| Text to Video | Text to Video | 720p | 94.6 credits/s | Output seconds × 94.6 |
| Text to Video | Text to Video | 1080p | 232.8 credits/s | Output seconds × 232.8 |
| Image to Video | Image to Video | 480p | 44.1 credits/s | Output seconds × 44.1 |
| Image to Video | Image to Video | 720p | 94.6 credits/s | Output seconds × 94.6 |
| Image to Video | Image to Video | 1080p | 232.8 credits/s | Output seconds × 232.8 |
| Reference to Video | Text/Image to Video | 480p | 44.1 credits/s | Output seconds × 44.1 |
| Reference to Video | Video to Video | 480p | 26.5 credits/s | (input + output) × 26.5 |
| Reference to Video | Text/Image to Video | 720p | 94.6 credits/s | Output seconds × 94.6 |
| Reference to Video | Video to Video | 720p | 56.8 credits/s | (input + output) × 56.8 |
| Reference to Video | Text/Image to Video | 1080p | 232.8 credits/s | Output seconds × 232.8 |
| Reference to Video | Video to Video | 1080p | 139.7 credits/s | (input + output) × 139.7 |
| Seedance 2.5 | Video to Video | 480p | 17 credits/s | (input + output) × 17 |
| Seedance 2.5 | Text/Image to Video | 480p | 28 credits/s | Output seconds × 28 |
| Seedance 2.5 | Video to Video | 720p | 38 credits/s | (input + output) × 38 |
| Seedance 2.5 | Text/Image to Video | 720p | 63 credits/s | Output seconds × 63 |
| Seedance 2.5 | Video to Video | 1080p | 68.5 credits/s | (input + output) × 68.5 |
| Seedance 2.5 | Text/Image to Video | 1080p | 114 credits/s | Output seconds × 114 |

## Common errors

| Status | Meaning |
| --- | --- |
| `400` | Invalid request payload |
| `401` | Missing or invalid API key |
| `402` | Insufficient credits or plan limit |
| `404` | Model or task not found |
| `429` | Rate limit exceeded |
| `500` | Server error |