# Bytedance Seedance 1.5 Pro (Build 251215) — Text To Video

> Access the Seedance 1.5 Pro API for cinematic AI video generation. Use ByteDance technology for character consistency and multi-shot storyboarding via GPTProto.

## Overview

- **Endpoint**: `POST https://gptproto.com/api/v3/doubao/seedance-1-5-pro-251215/text-to-video`
- **Result URL**: `GET https://gptproto.com/api/v3/predictions/{result_id}/result` — the submit response also returns the authoritative URL in `data.urls.get`
- **Model ID**: `seedance-1-5-pro-251215`
- **Vendor**: Bytedance
- **Scene**: `text-to-video`
- **Category**: text-to-video
- **Modalities**: input text → output video
- **Playground**: https://gptproto.com/model/bytedance/seedance-1-5-pro-251215
- **API documentation**: https://docs.gptproto.com
- **Other scenes of this model**: `image-to-video` — same auth, different endpoint path and input schema

## Authentication

Every request needs a GPTProto API key in the `Authorization` header. Create one at https://gptproto.com/dashboard/api-key, then export it:

```bash
export GPTPROTO_API_KEY="your-api-key"
```

Header: `Authorization: Bearer $GPTPROTO_API_KEY` (plus `Content-Type: application/json` on POST).

## Pricing

Platform price by tier (USD, already includes the GPTProto discount):

- Cheapest tier — **480p · 16:9 · 4**: $0.0408 per run
- Most expensive tier — **1080p · 1:1 · 12**: $1.2 per run
- 324 priced tiers in total; the parameters below select the tier.
  - `resolution`: 1080p, 480p, 720p
  - `generate_audio`: no, yes
  - `ratio`: 1:1, 16:9, 21:9, 3:4, 4:3, 9:16
  - `duration`: 4–12
- Example — resolution=480p, generate_audio=no, ratio=16:9, duration=4: $0.0408
- Example — resolution=720p, generate_audio=no, ratio=16:9, duration=11: $0.2431
- Example — resolution=1080p, generate_audio=yes, ratio=1:1, duration=12: $1.2

Price range: $0.0408 – $1.2 per generation.

Prices may change. The model page always shows the live price: https://gptproto.com/model/bytedance/seedance-1-5-pro-251215

## API Information

The API is asynchronous: POST the endpoint to create a prediction, then poll its result URL until `status` is `completed` or `failed`.

### Input Schema

The endpoint accepts the following JSON body parameters:

- **`prompt`** (`string`, _required_):
  The positive prompt for the generation.

- **`aspect_ratio`** (`enum`, _optional_):
  The aspect ratio of the generated media.
  - Default: `4:3`
  - Options: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16

- **`duration`** (`enum`, _optional_):
  The duration of the generated media in seconds.
  - Default: `5`
  - Options: 4, 5, 6, 7, 8, 9, 10, 11, 12

- **`resolution`** (`enum`, _optional_):
  Video resolution.
  - Default: `720p`
  - Options: 720p, 480p

- **`generate_audio`** (`enum`, _optional_):
  Whether to generate audio.
  - Default: `true`
  - Options: no, yes

- **`camera_fixed`** (`boolean`, _optional_):
  Whether to fix the camera position.
  - Options: true, false

- **`seed`** (`range`, _optional_):
  The random seed to use for the generation. -1 means a random seed will be used.
  - Default: `-1`
  - Range: -1–2147483647

**Required Parameters Example**:

```json
{
  "prompt": "A tiny origami fox sailing a teacup across a moonlit puddle"
}
```

**Full Example**:

```json
{
  "prompt": "A tiny origami fox sailing a teacup across a moonlit puddle",
  "aspect_ratio": "4:3",
  "duration": 5,
  "resolution": "720p",
  "generate_audio": true,
  "camera_fixed": false,
  "seed": -1
}
```

### Output Schema

Both submit and poll return the same envelope:

- **`data.id`** (`string`): Prediction id. Use it as `result_id` when polling for the result.
- **`data.status`** (`string`): One of `created`, `running`, `completed`, `failed`. See Status Values below.
- **`data.outputs`** (`array of string`): Generated files. Empty until `status` is `completed`; then it holds the output URLs (or base64 strings when the model exposes a base64 option).
- **`data.urls.get`** (`string`): Authoritative result URL for this prediction. Prefer it over building the poll URL yourself.
- **`data.error`** (`string | null`): Failure reason when `status` is `failed`, otherwise `null`.
- **`data.executionTime`** (`integer`): Total processing time in milliseconds.
- **`data.timings.inference`** (`integer`): Model inference time in milliseconds.
- **`data.hasNsfwContents`** (`array of boolean`): Per-output moderation flags.
- **`message`** (`string`): `success` on a normal response, otherwise the error message.
- **`code`** (`integer`): Business status code. `200` means the request was accepted.

**Example Response — submit (task accepted)**:

```json
{
  "data": {
    "id": "pred_example_01",
    "model": "seedance-1-5-pro-251215",
    "outputs": [],
    "urls": {
      "get": "https://gptproto.com/api/v3/predictions/pred_example_01/result"
    },
    "hasNsfwContents": [],
    "status": "created",
    "createdAt": "2026-01-01T12:00:00Z",
    "executionTime": 0,
    "timings": {
      "inference": 0
    }
  },
  "message": "success",
  "code": 200
}
```

**Example Response — poll (completed)**:

```json
{
  "data": {
    "id": "pred_example_01",
    "model": "seedance-1-5-pro-251215",
    "outputs": [
      "https://oss-us.gptproto.com/example/output.mp4"
    ],
    "urls": {
      "get": "https://gptproto.com/api/v3/predictions/pred_example_01/result"
    },
    "status": "completed",
    "error": null,
    "executionTime": 12345,
    "timings": {
      "inference": 12000
    },
    "has_nsfw_contents": [],
    "created_at": "2026-01-01T12:00:00Z"
  },
  "message": "success",
  "code": 200
}
```

### Status Values

- `created` — Task accepted. Use `data.id` as `result_id` for polling.
- `running` — Generation is in progress. Keep polling.
- `completed` — Finished successfully. Generated files are in `data.outputs`.
- `failed` — Generation failed. Read `data.error` for the reason.

## Usage Examples

### 1. Submit a request

```bash
curl --request POST "https://gptproto.com/api/v3/doubao/seedance-1-5-pro-251215/text-to-video" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
    "prompt": "A tiny origami fox sailing a teacup across a moonlit puddle",
    "aspect_ratio": "4:3",
    "duration": 5,
    "resolution": "720p",
    "generate_audio": true,
    "camera_fixed": false,
    "seed": -1
  }'
```

```python
import os
import requests

url = "https://gptproto.com/api/v3/doubao/seedance-1-5-pro-251215/text-to-video"
headers = {
  "Authorization": f"Bearer {os.environ['GPTPROTO_API_KEY']}",
  "Content-Type": "application/json"
}
payload = {
  "prompt": "A tiny origami fox sailing a teacup across a moonlit puddle",
  "aspect_ratio": "4:3",
  "duration": 5,
  "resolution": "720p",
  "generate_audio": True,
  "camera_fixed": False,
  "seed": -1
}

response = requests.request("POST", url, headers=headers, json=payload)
print(response.json())
```

```typescript
const response = await fetch("https://gptproto.com/api/v3/doubao/seedance-1-5-pro-251215/text-to-video", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.GPTPROTO_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    prompt: "A tiny origami fox sailing a teacup across a moonlit puddle",
    aspect_ratio: "4:3",
    duration: 5,
    resolution: "720p",
    generate_audio: true,
    camera_fixed: false,
    seed: -1,
  }),
});

const data = await response.json();
console.log(data);
```

### 2. Poll until the task finishes

Replace `YOUR_RESULT_ID` with `data.id` from the submit response (or call `data.urls.get` directly), and keep polling every 1–3 seconds while `status` is `created` or `running`.

```bash
result_id="YOUR_RESULT_ID"

curl --request GET "https://gptproto.com/api/v3/predictions/$result_id/result" \
  --header "Authorization: Bearer $GPTPROTO_API_KEY"
```

```python
import os
import requests

result_id = "YOUR_RESULT_ID"
url = f"https://gptproto.com/api/v3/predictions/{result_id}/result"
headers = {
  "Authorization": f"Bearer {os.environ['GPTPROTO_API_KEY']}"
}
response = requests.request("GET", url, headers=headers)
print(response.json())
```

```typescript
const result_id = "YOUR_RESULT_ID";
const response = await fetch(`https://gptproto.com/api/v3/predictions/${result_id}/result`, {
  method: "GET",
  headers: {
    "Authorization": `Bearer ${process.env.GPTPROTO_API_KEY}`,
  },
});

const data = await response.json();
console.log(data);
```

## Example Prompts

- Frame 1: A man reclines on a beige leather seat of a wooden speedboat, holding a crystal glass of amber-colored spirit in one hand. He wears a white linen shirt and beige trousers, sunlight illuminating his watch against a backdrop of calm blue water. Camera transition: A close-u…
- A tiger moves stealthily through the dense underbrush of a shadowy jungle, muscles rippling beneath his striped coat. His whiskers twitch as he pauses, sensing movement ahead. Shafts of muted sunlight cut through the canopy, illuminating his narrowed eyes as he crouches low, the…
- low-angle dolly shot, the camera tilts upward to reveal a towering medieval castle. Knights march through the gates, banners waving in the wind. Horses gallop past, hooves kicking dust into the air. dramatic fantasy atmosphere

## HTTP Status Codes

- `400` — malformed body, a parameter or value this model does not accept, or input blocked by the provider's content moderation
- `401` — missing or invalid API key
- `403` — insufficient credits
- `413` — request body too large
- `429` — rate limited; retry with backoff
- `500` — An internal server error occurred
- `502` — An internal server error occurred
- `504` — Gateway timeout — upstream service did not respond in time; retry later

## Additional Resources

- [Model playground](https://gptproto.com/model/bytedance/seedance-1-5-pro-251215)
- [API documentation](https://docs.gptproto.com)
- [All models](https://gptproto.com/model)
- [API keys](https://gptproto.com/dashboard/api-key)
- [Platform overview for LLMs](https://gptproto.com/llm-full.txt)
- Any other model: `https://gptproto.com/model/{vendor}/{model}/{scene}/llms.txt`