# Kling 2.6

> Kling 2.6 by Kuaishou: affordable 5 or 10 second clips from a description or a photo. Pro (1080p) adds sound and the last frame.

Kling 2.6 is a Kuaishou video model. 5 or 10 second clips from a description or a photo (the first frame).

Standard (720p) is the most affordable, without sound. Pro (1080p) has higher quality and lets you turn on sound (effects, music, voices) or set the last frame; sound and the last frame do not work together. You pay per second of the clip.

One model, `kling-2.6` · ~3 min. The result follows the `input` fields (prompt, frames, references, `video_mode`, duration) — there are no separate «animate / edit» endpoints.



## Features

- `generate_audio` — audio in the clip

## Price

| Resolution | No sound, per second | With sound, per second |
|---|---|---|
| 720p | $0.048 | — |
| 1080p | $0.082 | $0.163 |

- Price = per-second price × clip length, rounded up to $0.001. Charged when the task is created and fully refunded if it fails.
- Sound (`generate_audio: true`) and the last frame need `1080p` (pro) and do not work together.



## Parameters (field `input`)

| Parameter | Description | Values (default in bold) |
|---|---|---|
| `prompt` | What happens in the clip: scene, motion, camera, light, style | text, up to 2500 chars |
| `first_frame_url` | First frame: a photo link (https); the video starts from it | `"https://…"` |
| `last_frame_url` | Last frame (optional, only together with the first one) | `"https://…"` |
| `resolution` | Quality = the Kling mode: `720p` — Standard (std), `1080p` — Pro (pro). You can also send `mode`: `std` / `pro` | **`720p`** · `1080p` |
| `aspect_ratio` | Aspect ratio | **`16:9`** · `9:16` · `1:1` |
| `duration` | Clip length in seconds | **`5`** `10` |
| `generate_audio` | Sound in the clip (effects, music, voices). Default `false`; with sound costs more — see the price | `true` `false` (default `false`) |

## Examples

### Prompt only

```bash
curl -X POST https://mixmedia.tech/api/v1/jobs/createTask \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"kling-2.6","input":{"prompt":"A drone flies over an autumn forest at sunrise, fog, cinematic","resolution":"720p","aspect_ratio":"16:9","duration":"5"}}'
```

```python
import os, requests

r = requests.post(
    "https://mixmedia.tech/api/v1/jobs/createTask",
    headers={"Authorization": f"Bearer {os.environ['API_KEY']}"},
    json={
      "model": "kling-2.6",
      "input": {
        "prompt": "A drone flies over an autumn forest at sunrise, fog, cinematic",
        "resolution": "720p",
        "aspect_ratio": "16:9",
        "duration": "5"
      }
    },
)
print(r.json())  # {"code": 200, "data": {"taskId": "..."}}
```

```javascript
const r = await fetch("https://mixmedia.tech/api/v1/jobs/createTask", {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.API_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({
    "model": "kling-2.6",
    "input": {
      "prompt": "A drone flies over an autumn forest at sunrise, fog, cinematic",
      "resolution": "720p",
      "aspect_ratio": "16:9",
      "duration": "5"
    }
  }),
});
console.log(await r.json()); // { code: 200, data: { taskId: "..." } }
```

### With a first frame

```bash
curl -X POST https://mixmedia.tech/api/v1/jobs/createTask \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"kling-2.6","input":{"prompt":"The character slowly turns to the camera, the wind moves the hair","first_frame_url":"https://mixmedia.tech/static/img/previews/gpt-t2i.jpg","resolution":"720p","duration":"5"}}'
```

```python
import os, requests

r = requests.post(
    "https://mixmedia.tech/api/v1/jobs/createTask",
    headers={"Authorization": f"Bearer {os.environ['API_KEY']}"},
    json={
      "model": "kling-2.6",
      "input": {
        "prompt": "The character slowly turns to the camera, the wind moves the hair",
        "first_frame_url": "https://mixmedia.tech/static/img/previews/gpt-t2i.jpg",
        "resolution": "720p",
        "duration": "5"
      }
    },
)
print(r.json())  # {"code": 200, "data": {"taskId": "..."}}
```

```javascript
const r = await fetch("https://mixmedia.tech/api/v1/jobs/createTask", {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.API_KEY}`, "Content-Type": "application/json" },
  body: JSON.stringify({
    "model": "kling-2.6",
    "input": {
      "prompt": "The character slowly turns to the camera, the wind moves the hair",
      "first_frame_url": "https://mixmedia.tech/static/img/previews/gpt-t2i.jpg",
      "resolution": "720p",
      "duration": "5"
    }
  }),
});
console.log(await r.json()); // { code: 200, data: { taskId: "..." } }
```

## Create and result

1. `POST /api/v1/jobs/createTask` with `model` and `input`.
2. Poll `GET /api/v1/jobs/recordInfo?taskId=…` every 3–5 s (or a [callback](https://docs.mixmedia.tech/en/callbacks)).

### Successful createTask (HTTP 200)

```json
{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_...",
    "task_id": "task_...",
    "status": "submitted"
  }
}
```

### Completed task (recordInfo)

```json
{
  "code": 200,
  "msg": "success",
  "data": {
    "taskId": "task_...",
    "task_id": "task_...",
    "state": "success",
    "status": "completed",
    "costUsd": "0.384",
    "refunded": false,
    "resultJson": {
      "videos": [
        {
          "url": "https://…/out.mp4"
        }
      ],
      "duration": 8
    }
  }
}
```

Aliases: `task_id` = `taskId`; `status`: `pending` / `processing` / `completed` / `failed` alongside `state`. Clip URL is in `resultJson`. `size` is an alias of `aspect_ratio` in `input`.


Photos can be any public https links or uploads via [files/upload](https://docs.mixmedia.tech/en/endpoints/upload). Videos and audio — via files/upload only.

## Error handling

API responses are JSON `{"code", "msg", "data"}`; errors also have a string `error` field (type). **On `/api/v1/*` the HTTP status matches body `code`.**

### Example response bodies

**400**

```json
{
  "code": 400,
  "msg": "input.duration: must be between 4 and 30, or \"auto\" / -1",
  "data": null,
  "error": "invalid_request_error"
}
```

**401**

```json
{
  "code": 401,
  "msg": "Authentication failed. Please check your API key",
  "data": null,
  "error": "authentication_error"
}
```

**402**

```json
{
  "code": 402,
  "msg": "Insufficient balance. Please top up and try again. Available: $0.01, required: $0.015. Top up at https://mixmedia.tech/cabinet/billing",
  "data": {
    "balance": "0.0100",
    "required": "0.0150",
    "currency": "USD",
    "topUpUrl": "https://mixmedia.tech/cabinet/billing"
  },
  "error": "payment_required"
}
```

**429**

```json
{
  "code": 429,
  "msg": "Rate limit exceeded: 10 createTask/upload requests per 10 s per key. Retry after 8s",
  "data": null,
  "error": "rate_limit_error"
}
```

**500**

```json
{
  "code": 500,
  "msg": "Internal server error",
  "data": null,
  "error": "server_error"
}
```

### Codes on createTask / upload

| code | error | Meaning | What to do |
|---|---|---|---|
| 400 | `invalid_request_error` | Invalid parameter or body | See `msg` |
| 400 | `unsupported_model` | Unknown model | [Model list](https://docs.mixmedia.tech/en/models) |
| 400 | `nsfw_content_detected` | Moderation / content policy — `msg` / `failMsg` is the upstream text verbatim | Read the refusal text, change the prompt or files |
| 401 | `authentication_error` | Missing or invalid key | Check the key |
| 402 | `payment_required` | Not enough balance | Top up |
| 403 | `permission_error` | No access | Contact support |
| 429 | `rate_limit_error` | Too many requests | Wait for `Retry-After` |
| 505 | `model_disabled` | Model temporarily disabled | Pick another |
| 500 | `server_error` | Our failure | Retry later |

Example `msg` values: `Authentication failed. Please check your API key` (401); `Insufficient balance. Please top up and try again…` (402).

### Task errors (recordInfo)

If the task was created and then failed: `state: "fail"` (alias `status: "failed"`), `failCode` / `failMsg`, and `error: { code, message, type }`. Money is refunded (`refunded: true`).

| failCode | error.type | Meaning |
|---|---|---|
| 400 | `nsfw_content_detected` / `invalid_request_error` | Moderation — `failMsg` is upstream text verbatim |
| 422 | `invalid_request_error` | The model rejected the parameters (length, mode, resolution, file) |
| 501 | `server_error` | The model could not generate (`failMsg`) |
| 504 | `timeout_error` | Timed out — retry |
| 500 / 503 | `server_error` | Service temporarily unavailable |

### Rate limits

| What | Limit |
|---|---|
| createTask and upload | 20 per 10 s per key |
| recordInfo / list / balance | 100 per 10 s per key |

Over the limit — HTTP 429 and `Retry-After`.