# Bytedance | Seedance 2.0 | Text to Video | Fast

A cutting-edge video generation model delivering cinematic visuals with native audio, realistic physics, and director-level camera control, supporting text, image, audio, and video inputs. "Please use this model only with AI-generated human faces, not real human faces. If you use real human faces, you accept full responsibility and liability for any consequences."

## API Information

- **Model Slug:** bytedance-seedance-2-0-text-to-video-fast
- **Branded URL:** https://www.eachlabs.ai/bytedance/seedance-2-0/bytedance-seedance-2-0-text-to-video-fast
- **Provider:** ByteDance
- **Category:** Text to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Base Cost:** 720p resolution (default): approximately $0.146 per second of output video
- **Estimated Processing Time:** 120 seconds
- **Last Updated:** 2026-08-12
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/bytedance-seedance-2-0-text-to-video-fast

## Pricing

- **Charge Type:** dynamic
- **Pricing Details:** 720p resolution (default): approximately $0.146 per second of output video

### Pricing Rules

| Condition | Pricing |
| --- | --- |
| resolution == "480p" | 480p resolution: approximately $0.0676 per second of output video |
| Rule 2 | 720p resolution (default): approximately $0.146 per second of output video |

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | Yes | - | - | The text prompt used to generate the video |
| resolution | string | No | 720p | 480p, 720p | Video resolution - 480p for faster generation, 720p for balance. |
| duration | string | No | auto | auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 | Duration of the video in seconds. Supports 4 to 15 seconds, or auto to let the model decide based on the prompt. |
| aspect_ratio | string | 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. |
| 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. |
| seed | string | No | - | - | Random seed for reproducibility. Note that results may still vary slightly even with the same seed. |
| end_user_id | string | No | - | - | The unique user ID of the end user. |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bytedance-seedance-2-0-text-to-video-fast",
  "input": {
    "prompt": "Ultra realistic modern cinematic reinterpretation of a 1920s gothic silent horror scene, tall thin vampire-like silhouette slowly climbing staircase, exaggerated shadow stretching along wall, high contrast black and white lighting, dramatic expressionist set design with distorted angles, slow cinematic push in, subtle film grain texture, eerie atmosphere,"
  }
}'
```

## Output Schema

Response returned by `GET /v1/prediction/{id}` when the job completes:

```json
{
  "status": "success",
  "predictionID": "string",
  "output": "string (URL of generated video)",
  "metrics": {
    "predict_time": "number (seconds)"
  }
}
```

## Polling

```bash
curl https://api.eachlabs.ai/v1/prediction/{PREDICTION_ID} \
  -H "Authorization: Bearer YOUR_API_KEY"
```

| Status | Meaning |
|--------|---------|
| `processing` | Still running — poll again |
| `success` | Done — read `output` |
| `error` | Failed — read `message` / `details` |

## Webhook (alternative to polling)

Pass `"webhook_url": "https://your.host/path"` in the create request. Eachlabs POSTs this payload when the job ends:

```json
{
  "exec_id": "prediction-uuid",
  "status": "succeeded",
  "output": "https://...",
  "error": ""
}
```

`status` is `"succeeded"` or `"failed"`. `exec_id` equals the `predictionID` from create. Return 2xx within 30 seconds.

## Errors

Error body: `{ "status": "error", "message": "...", "details": "..." }`

| Code | Meaning |
|------|---------|
| `400` | Invalid input |
| `401` | Missing / invalid `Authorization` bearer token |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Overview

**Bytedance | Seedance 2.0 | Text to Video | Fast Overview**

Bytedance | Seedance 2.0 | Text to Video | Fast is ByteDance's flagship AI video generation model that transforms text prompts, images, audio, and video clips into high-quality cinematic videos with native synchronized audio. Part of the Seedance family from ByteDance, it solves the challenge of creating realistic, controllable video content quickly for creators and developers. Its primary differentiator is advanced **timeline prompting** and multimodal inputs, enabling precise control over motion, physics, and scene sequences in a single generation pass.

This fast variant delivers 1080p output across 16:9, 9:16, and 1:1 aspect ratios, supporting up to 60-second clips with realistic physics and director-level camera movements. Accessible via API on platforms like each::labs, Bytedance | Seedance 2.0 | Text to Video | Fast empowers users to generate professional-grade videos efficiently, ideal for iterative workflows in content creation.

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `Authorization: Bearer YOUR_API_KEY`. Generate a key from the Eachlabs dashboard at https://www.eachlabs.ai/dashboard/api-keys.
- File-typed parameters (`*_url`, `image_url`, `video_url`, `audio_url`, etc.) accept publicly-reachable HTTPS URLs only. Upload your asset first (GCS / S3 / your CDN) and pass the resulting URL. Data-URIs and localhost URLs are rejected.
- For structured parameters (arrays / objects) send real JSON values, not stringified payloads.
- Monetary values are reported in USD; per-token / per-megapixel rates may be billed in micro-cents internally.
- Prefer `webhook_url` over polling for long-running predictions — see the Webhook Callback section.