# MiniMax H3 Max Turbo Video Extend API

> MiniMax H3 Max Turbo, the fastest tier of the H3 family post-trained by fal, continues an existing video with 1-15 seconds of new footage with native audio.

Source: https://www.sandbase.ai/models/minimax/h3-max-turbo/video-extend
API reference: https://www.sandbase.ai/models/minimax/h3-max-turbo/video-extend/docs

## Facts

- Provider: MiniMax
- Type: Video model
- Model ID: `minimax/h3-max-turbo/video-extend`
- Price: From $0.20 per run
- Capabilities: video to video
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Unified Run API: `POST https://api.sandbase.ai/v1/run`

```bash
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "minimax/h3-max-turbo/video-extend",
  "video": "https://storage.googleapis.com/falserverless/example_inputs/flux-3-red-panda.mp4",
  "output": "extended",
  "prompt": "The red panda keeps walking along the log, then looks up at a bird.",
  "duration": 5,
  "resolution": "768P"
}'
```

The response returns a run id; poll `GET https://api.sandbase.ai/v1/run/{id}` until the status is `completed` or `failed`.

## FAQ

### How do I call MiniMax H3 Max Turbo Video Extend through SandBase?

Create a SandBase API key, then send requests with the model ID "minimax/h3-max-turbo/video-extend" to Unified Run API (/v1/run) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### Do I need a separate MiniMax account?

No. One SandBase API key and balance gives you access to MiniMax H3 Max Turbo Video Extend and the other models in the catalog; you do not need to sign up with MiniMax separately.

## README

### MiniMax H3 Max Turbo Video Extend

MiniMax H3 Max Turbo video extend: continue an existing video with 1–15 seconds of new footage; return the joined clip or only the continuation.

#### Fields

| Field | Type | Default | Notes |
|---|---|---|---|
| `prompt` | string, required | — | Up to 50,000 characters. |
| `aspect_ratio` | `21:9` / `16:9` / `4:3` / `1:1` / `3:4` / `9:16` | — | Output frame shape. |
| `video` | video URL, required | — | Clip to continue. |
| `resolution` | `480P` / `768P` / `1080P` / `2K` | `768P` | Sets the per-second rate. |
| `duration` | integer 1–15 | 5 | Seconds of new footage. |
| `seed` | integer | random | Fix it to compare prompt changes. |
| `reference_audio_urls` | audio URL[] | — | Optional reference audio for the new footage. |
| `output` | `extended` / `continuation` | `extended` | `extended` returns source + new footage; `continuation` returns only the new part. |

#### Billing

You pay for new seconds: $0.025 at 480P, $0.04 at 768P, $0.08 at 1080P, $0.16 at 2K.

| Output | 480P | 768P | 1080P | 2K |
|---|---|---|---|---|
| 5s (default) | $0.125 | $0.20 | $0.40 | $0.80 |
| 10s | $0.25 | $0.40 | $0.80 | $1.60 |
| 15s | $0.375 | $0.60 | $1.20 | $2.40 |

Failed runs are not charged.

#### Prompting

- Describe what happens next, not what is already in the clip.

#### Also on SandBase

Other H3 Max Turbo endpoints: `minimax/h3-max-turbo/text-to-video`, `minimax/h3-max-turbo/image-to-video`, `minimax/h3-max/text-to-video` (H3 Max).