# Kling | o3 | Standard | Reference to Video

Transforms images, elements, and text into consistent, high-quality video scenes while maintaining stable character identity, detailed objects, and coherent environments.

## API Information

- **Model Slug:** kling-o3-standard-reference-to-video
- **Branded URL:** https://www.eachlabs.ai/kling/kling-o3/kling-o3-standard-reference-to-video
- **Provider:** Kling
- **Category:** Reference to Video
- **Output Type:** video
- **Status:** active
- **Version:** 0.0.1
- **Estimated Processing Time:** 110 seconds
- **Last Updated:** 2026-06-01
- **Interactive Demo:** https://www.eachlabs.ai/ai-models/kling-o3-standard-reference-to-video

## Pricing

Pricing information not available.

## Input Schema

| Parameter | Type | Required | Default | Constraints | Description |
|-----------|------|----------|---------|-------------|-------------|
| prompt | string | No | - | - | Text prompt for video generation. Either prompt or multi_prompt must be provided, but not both. |
| multi_prompt | array | No | - | 0–4 | List of prompts for multi-shot video generation. |
| start_image_url | string | No | - | - | Image to use as the first frame of the video. |
| end_image_url | string | No | - | - | Image to use as the last frame of the video. Note: This field is not used when multi-prompt is selected. |
| image_urls | array | No | - | 0–4 | Reference images for style/appearance. Reference in prompt as @Image1, @Image2, etc. Maximum 4 total (elements + reference images) when using video. |
| elements | array | No | - | 0–3 | Elements Optional reference subjects to include in the generation. Use them in the prompt as @Element1, @Element2, or @Element3. Each element must include either frontal_image_url and reference_image_urls together, or a video_url. |
| generate_audio | boolean | No | false | - | Whether to generate native audio for the video. |
| duration | string | No | 5 | 3,4,5,6,7,8,9,10,11,12,13,14,15 | Video duration in seconds (3-15s). |
| aspect_ratio | string | No | - | 16:9,9:16,1:1 | The aspect ratio of the generated video frame. |
| shot_type | string | No | customize | customize | The type of multi-shot video generation. |

## Example Request

```bash
curl -X POST https://api.eachlabs.ai/v1/prediction/ \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "kling-o3-standard-reference-to-video",
  "input": {}
}'
```

## 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 "X-API-Key: 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 `X-API-Key` |
| `404` | Unknown model or prediction id |
| `429` | Rate limit — 100 creates / min, 10 concurrent per key |
| `5xx` | Retry with backoff |

## Usage Notes

- API Base URL: `https://api.eachlabs.ai/v1`
- Authentication: send `X-API-Key: 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.