# MiniMax H3 Max Recast

> Recast the people in a video with MiniMax H3 Max — one reference photo per new person, replacing the main people left to right while keeping the source motion, camera, cuts, and sound. Sources of 5-30s with no single shot over 15s, output up to 1080p.

## Overview

- **Model ID**: `minimax-h3-max-recast`
- **Workflow**: `minimax/h3-max/recast`
- **Provider**: MiniMax
- **Origin**: Partner Model
- **Category**: Video → Video (video)
- **Output**: A video URL.
- **Tags**: character swap, video input, multi-image input, 1080p
- **Unified endpoint**: `POST https://api.picsart.com/workflows/v1/models/execute` (model id in the body)
- **Compatibility endpoint**: `POST https://api.picsart.com/workflows/minimax/h3-max/recast/execute` (vendor's own parameters)
- **Execution**: long-running — use the async submit/poll pair or the SDK, which polls for you
- **Model page**: https://picsart.com/api-platform/models/minimax-h3-max-recast

## Pricing

Rates are in USD. Every row below is an exact rate for the settings it names — the columns are the settings that change the price for this model. Every response reports what was actually charged in `response.usage.credits`.

| Tier | Rate |
| --- | --- |
| 768p | $0.33 / sec |
| 1080p | $0.495 / sec |

Published rates. Volume pricing, invoicing and annual agreements: https://picsart.com/api-platform/contact-sales

## Authentication

The SDK and the REST API authenticate with a Picsart API key sent as a bearer token. Create a key in the console at https://picsart.com/api-platform/dashboard/api-keys, keep it in a server-side environment variable, and never ship it in browser code or commit it.

```bash
export PICSART_API_KEY="YOUR_KEY"
```

```http
Authorization: Bearer $PICSART_API_KEY
```

The CLI and the MCP server do not use an API key: `gen-ai login` signs in through the browser once per machine and stores a token locally.

## Interfaces

- **SDK (TypeScript)** — `@picsart/ai-sdk` (Node 20+, ESM). Type-safe `ai.generate()` / `ai.generateText()` with per-model parameter types; polls long jobs for you.
- **SDK (Python)** — `picsart-ai-sdk` (Python 3.10+, async). The same surface in snake_case: `await ai.generate()` / `await ai.generate_text()`, with a typed input per model.
- **REST** — the API gateway at `https://api.picsart.com`. Sync `/execute`, or async `/submit` + `/{taskId}/result`.
- **CLI** — `@picsart/gen-ai` (`gen-ai`). Generate from a terminal, quote cost before spending, emit JSON for pipelines.
- **MCP** — the same models inside Claude Code, Cursor, Windsurf and other MCP hosts. Setup: https://picsart.com/gen-ai-mcp/

```bash
npm install @picsart/ai-sdk      # SDK (TypeScript)
pip install picsart-ai-sdk       # SDK (Python)
npm install -g @picsart/gen-ai   # CLI (also drives the MCP server)
```

## Unified API (recommended)

One parameter set, used by the SDK and by REST alike: the names below are what `ai.generate('minimax-h3-max-recast', …)` takes, and what goes inside the inner `params` of a REST call. Over REST the model id travels in the body, not the path — one workflow, `v1/models`, fronts the whole catalogue.

### Execution modes

- **Sync** — `POST /workflows/v1/models/execute` returns the result in one call. Only for jobs that finish within ~20 seconds; otherwise it times out.
- **Async** — `POST /workflows/v1/models/submit` returns a task id; poll `GET /workflows/v1/models/{taskId}/result` until `response.status` is `COMPLETED` or `FAILED`. Task statuses: `ACCEPTED` · `IN_PROGRESS` · `COMPLETED` · `FAILED`.
- **SDK** — `ai.generate()` always awaits the finished result; polling is hidden.

Video jobs routinely outrun the sync limit: use async over REST, or the SDK, which polls for you.

### Input parameters

- **`prompt`** (`string`, _optional_): What to make, in plain language: the subject, style, composition and motion. With an input image or video, what to change.
  - Max length: 2000 characters
  - e.g. "Optional — who becomes whom, or what else to keep or change..."
- **`videoUrl`** (`string`, _required_): The video to work on, as a URL.
  - Accepts: video URL, up to 30s
- **`imageUrls`** (`list<string>`, _required_): Input images, as URLs: frames to animate, or references for subject, style or composition.
  - Accepts: image URLs (max 4)
- **`resolution`** (`string`, _optional_): Output size. Higher costs more and takes longer.
  - Default: `"1080p"`
  - Options: `768p`, `1080p`
- **`enhanceRealism`** (`boolean`, _optional_): Enhance Realism
  - Default: `false`
- **`seed`** (`number`, _optional_): Seed for the random generator. The same seed and inputs repeat a result; leave it out for a random one.
  - Range: 0–2147483647 (step 1)
- **`enableSafetyChecker`** (`boolean`, _optional_): Run the vendor's safety check on the result.
  - Default: `true`

### Input JSON Schema

The inner `params` object. Over REST it is wrapped as `{ "params": { "model": "<id>", "params": <this> } }`; the SDK takes it directly.

```json
{
  "type": "object",
  "required": [
    "videoUrl",
    "imageUrls"
  ],
  "properties": {
    "prompt": {
      "type": "string",
      "maxLength": 2000,
      "description": "What to make, in plain language: the subject, style, composition and motion. With an input image or video, what to change."
    },
    "videoUrl": {
      "type": "string",
      "format": "uri",
      "description": "The video to work on, as a URL."
    },
    "imageUrls": {
      "type": "array",
      "items": {
        "type": "string",
        "format": "uri",
        "description": "image URL"
      },
      "maxItems": 4,
      "description": "Input images, as URLs: frames to animate, or references for subject, style or composition."
    },
    "resolution": {
      "type": "string",
      "enum": [
        "768p",
        "1080p"
      ],
      "default": "1080p",
      "description": "Output size. Higher costs more and takes longer."
    },
    "enhanceRealism": {
      "type": "boolean",
      "default": false,
      "description": "Enhance Realism"
    },
    "seed": {
      "type": "number",
      "minimum": 0,
      "maximum": 2147483647,
      "multipleOf": 1,
      "description": "Seed for the random generator. The same seed and inputs repeat a result; leave it out for a random one."
    },
    "enableSafetyChecker": {
      "type": "boolean",
      "default": true,
      "description": "Run the vendor's safety check on the result."
    }
  },
  "additionalProperties": false
}
```

### Required parameters example

The required parameters plus the defaults that shape the output, as a REST body:

```json
{
  "params": {
    "model": "minimax-h3-max-recast",
    "params": {
      "prompt": "A serene mountain lake at golden hour, ultra detailed",
      "videoUrl": "https://cdn.example.com/input.mp4",
      "imageUrls": [
        "https://cdn.example.com/input.jpg"
      ],
      "resolution": "1080p"
    }
  }
}
```

### Response

The body is the gateway's status envelope: the output is at `response.result`, next to the task id, its status and the credits charged. Asset models return `url` plus an `items` array of results.

```json
{
  "status": "success",
  "response": {
    "id": "task_abc123",
    "status": "COMPLETED",
    "result": {
      "url": "https://cdn.picsart.com/…/result",
      "items": [
        {
          "url": "https://cdn.picsart.com/…/result"
        }
      ],
      "model": "minimax-h3-max-recast"
    }
  }
}
```

What `ai.generate()` / `ai.generateText()` resolve to (the envelope already unwrapped):

```json
{
  "items": [
    {
      "url": "https://cdn.picsart.com/…/result"
    }
  ],
  "model": "minimax-h3-max-recast"
}
```

### Usage examples

#### TypeScript (SDK)

```typescript
import { createClient } from '@picsart/ai-sdk';

const ai = createClient({
  apiKey: process.env.PICSART_API_KEY,
  apiUrl: 'https://api.picsart.com',
});

const result = await ai.generate('minimax-h3-max-recast', {
  prompt: "A serene mountain lake at golden hour, ultra detailed",
  videoUrl: "https://cdn.example.com/input.mp4",
  imageUrls: [
    "https://cdn.example.com/input.jpg"
  ],
  resolution: "1080p"
});

console.log(result.url); // video URL
```

#### Python (SDK)

```python
import asyncio
import os

from picsart_ai_sdk import create_client


async def main() -> None:
    async with create_client(
        api_key=os.environ["PICSART_API_KEY"],
        api_url="https://api.picsart.com",
    ) as ai:
        result = await ai.generate("minimax-h3-max-recast", {
            "prompt": "A serene mountain lake at golden hour, ultra detailed",
            "videoUrl": "https://cdn.example.com/input.mp4",
            "imageUrls": [
                "https://cdn.example.com/input.jpg",
            ],
            "resolution": "1080p",
        })

        print(result.url)  # video URL


asyncio.run(main())
```

#### cURL (sync)

```bash
curl -X POST 'https://api.picsart.com/workflows/v1/models/execute' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "model": "minimax-h3-max-recast",
    "params": {
      "prompt": "A serene mountain lake at golden hour, ultra detailed",
      "videoUrl": "https://cdn.example.com/input.mp4",
      "imageUrls": [
        "https://cdn.example.com/input.jpg"
      ],
      "resolution": "1080p"
    }
  }
}'
```

#### cURL (async: submit, then poll)

```bash
# 1. Submit the job
curl -X POST 'https://api.picsart.com/workflows/v1/models/submit' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "model": "minimax-h3-max-recast",
    "params": {
      "prompt": "A serene mountain lake at golden hour, ultra detailed",
      "videoUrl": "https://cdn.example.com/input.mp4",
      "imageUrls": [
        "https://cdn.example.com/input.jpg"
      ],
      "resolution": "1080p"
    }
  }
}'
# → { "status": "success", "response": { "id": "task_abc123" } }

# 2. Poll until response.status is COMPLETED
curl 'https://api.picsart.com/workflows/v1/models/task_abc123/result' \
  -H 'Authorization: Bearer $PICSART_API_KEY'
```

#### CLI

```bash
gen-ai login  # once per machine
gen-ai models info minimax-h3-max-recast  # this model's parameters
gen-ai pricing minimax-h3-max-recast  # quote before spending credits
gen-ai generate -m minimax-h3-max-recast \
  -p "A serene mountain lake at golden hour" \
  -i ./input.jpg
```

## Compatibility API (vendor parameters)

Alongside the unified API, the `minimax/h3-max/recast` workflow takes MiniMax's own parameters exactly as the vendor defines them — nothing renamed or reshaped. It is the shortest path onto Picsart for request bodies already written against the vendor; the trade is that a request is written for one vendor, and the result comes back in the vendor's own shape. Same authentication.

- **Endpoint**: `POST https://api.picsart.com/workflows/minimax/h3-max/recast/execute` (sync) · `POST …/submit` + `GET …/{taskId}/result` (async)
- **SDK**: `ai.apis.run('minimax/h3-max/recast', params, { mode })` in TypeScript, `ai.apis.run("minimax/h3-max/recast", params, mode=…)` in Python — params forwarded verbatim

### Vendor parameters

| Parameter | Type | Required | Default | Details |
| --- | --- | --- | --- | --- |
| `enable_safety_checker` | `boolean` | no | `true` | Authorized callers may set false to request relaxed screening. |
| `resolution` | `string` | no | `1080P` | Options: `768P`, `1080P` |
| `video_url` | `string` | yes | — | The source video, 5 to 30 seconds long, with no single shot longer than 15 seconds. · e.g. `https://v3b.fal.media/files/b/0aac8cc6/lOHY4Mitfg5x1UDerR3RB_dw9Hs7ChHU-Fqwzz0W9cq_video.mp4` |
| `enhance_realism` | `boolean` | no | `false` | More natural skin textures and better blending of the new people into the scene. Off unless set. · e.g. `true` |
| `reference_image_urls` | `string[]` | yes | — | One photo per new person. By default they replace the main people in the video from left to right, each in every shot they appear in. · max 4 items · e.g. `["https://v3b.fal.media/files/b/0aac8d26/HVno2j68vj7tkAwGo3Qii_Nolan%203.jpg"]` |
| `prompt` | `string` | no | — | Optional: who becomes whom, or what else to keep or change. · max 2000 chars |
| `seed` | `integer` | no | — | Random seed. Leave empty for a random one. · min 0 |
| `options` | `object` | no | — | Platform-specific options for safety checks and Picsart Drive integration. |
| └ `safety_checks` | `object` | no | — | Safety check configuration. |
| └   `enabled` | `boolean` | no | `true` | Enable or disable text safety checks. Defaults to true. |
| └ `drive` | `object` | no | — | Picsart Drive storage options. When provided, the result will be saved to the user's Drive. |
| └   `name` | `string` | yes | — | Filename to save the result as in Picsart Drive. |
| └   `attributes` | `object` | no | — | Additional file metadata attributes. |
| └   `folder` | `object` | no | — | Destination folder in Picsart Drive. |

### Example request body

```json
{
  "params": {
    "video_url": "https://v3b.fal.media/files/b/0aac8cc6/lOHY4Mitfg5x1UDerR3RB_dw9Hs7ChHU-Fqwzz0W9cq_video.mp4",
    "reference_image_urls": [
      "https://v3b.fal.media/files/b/0aac8d26/HVno2j68vj7tkAwGo3Qii_Nolan%203.jpg"
    ],
    "prompt": "A serene mountain lake at golden hour, ultra detailed"
  }
}
```

### Usage examples

#### TypeScript (`ai.apis.run`)

```typescript
import { createClient, ApiRunMode } from '@picsart/ai-sdk';

const ai = createClient({
  apiKey: process.env.PICSART_API_KEY,
  apiUrl: 'https://api.picsart.com',
});

// Calls the 'minimax/h3-max/recast' workflow directly — params are sent as-is.
const { result, usage } = await ai.apis.run('minimax/h3-max/recast', {
  video_url: "https://v3b.fal.media/files/b/0aac8cc6/lOHY4Mitfg5x1UDerR3RB_dw9Hs7ChHU-Fqwzz0W9cq_video.mp4",
  reference_image_urls: [
    "https://v3b.fal.media/files/b/0aac8d26/HVno2j68vj7tkAwGo3Qii_Nolan%203.jpg"
  ],
  prompt: "A serene mountain lake at golden hour, ultra detailed"
}, {
  mode: ApiRunMode.SYNC,
});

console.log(result); // workflow-specific output
console.log(usage?.credits); // amount charged, in $
```

#### Python (`ai.apis.run`)

```python
import asyncio
import os

from picsart_ai_sdk import ApiRunMode, create_client


async def main() -> None:
    async with create_client(
        api_key=os.environ["PICSART_API_KEY"],
        api_url="https://api.picsart.com",
    ) as ai:
        # Calls the 'minimax/h3-max/recast' workflow directly — params are sent as-is.
        response = await ai.apis.run("minimax/h3-max/recast", {
            "video_url": "https://v3b.fal.media/files/b/0aac8cc6/lOHY4Mitfg5x1UDerR3RB_dw9Hs7ChHU-Fqwzz0W9cq_video.mp4",
            "reference_image_urls": [
                "https://v3b.fal.media/files/b/0aac8d26/HVno2j68vj7tkAwGo3Qii_Nolan%203.jpg",
            ],
            "prompt": "A serene mountain lake at golden hour, ultra detailed",
        }, mode=ApiRunMode.SYNC)

        print(response["result"])  # workflow-specific output
        print((response.get("usage") or {}).get("credits"))  # amount charged, in $


asyncio.run(main())
```

#### cURL (sync)

```bash
curl -X POST 'https://api.picsart.com/workflows/minimax/h3-max/recast/execute' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "video_url": "https://v3b.fal.media/files/b/0aac8cc6/lOHY4Mitfg5x1UDerR3RB_dw9Hs7ChHU-Fqwzz0W9cq_video.mp4",
    "reference_image_urls": [
      "https://v3b.fal.media/files/b/0aac8d26/HVno2j68vj7tkAwGo3Qii_Nolan%203.jpg"
    ],
    "prompt": "A serene mountain lake at golden hour, ultra detailed"
  }
}'
```

#### cURL (async: submit, then poll)

```bash
# 1. Submit the job
curl -X POST 'https://api.picsart.com/workflows/minimax/h3-max/recast/submit' \
  -H 'Authorization: Bearer $PICSART_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
  "params": {
    "video_url": "https://v3b.fal.media/files/b/0aac8cc6/lOHY4Mitfg5x1UDerR3RB_dw9Hs7ChHU-Fqwzz0W9cq_video.mp4",
    "reference_image_urls": [
      "https://v3b.fal.media/files/b/0aac8d26/HVno2j68vj7tkAwGo3Qii_Nolan%203.jpg"
    ],
    "prompt": "A serene mountain lake at golden hour, ultra detailed"
  }
}'
# → { "status": "success", "response": { "id": "wf_abc123" } }

# 2. Poll until response.status is COMPLETED
curl 'https://api.picsart.com/workflows/minimax/h3-max/recast/wf_abc123/result' \
  -H 'Authorization: Bearer $PICSART_API_KEY'
```

### Response

Over HTTP the vendor-shaped result arrives inside the gateway envelope at `response.result`:

```json
{
  "status": "success",
  "response": {
    "id": "wf_abc123",
    "status": "COMPLETED",
    "result": {
      "seed": 0,
      "video": {
        "content_type": "image/png",
        "url": "https://cdn.picsart.com/…/result.jpg",
        "file_name": "z9RV14K95DvU.png",
        "file_size": 4404019
      }
    }
  }
}
```

`ai.apis.run()` unwraps that envelope and resolves to `{ result, usage }`:

```json
{
  "result": {
    "seed": 0,
    "video": {
      "content_type": "image/png",
      "url": "https://cdn.picsart.com/…/result.jpg",
      "file_name": "z9RV14K95DvU.png",
      "file_size": 4404019
    }
  }
}
```

## Additional resources

- Model page (playground): https://picsart.com/api-platform/models/minimax-h3-max-recast
- SDK and REST API (unified): https://picsart.com/api-platform/models/minimax-h3-max-recast#api
- Compatibility API (vendor parameters): https://picsart.com/api-platform/models/minimax-h3-max-recast#advanced
- Pricing: https://picsart.com/api-platform/models/minimax-h3-max-recast#pricing
- This document: https://picsart.com/api-platform/models/minimax-h3-max-recast/llms.txt
- All models: https://picsart.com/api-platform/models
- Docs — quickstart https://picsart.com/api-platform/docs/quickstart, authentication https://picsart.com/api-platform/docs/authentication, SDK https://picsart.com/api-platform/docs/sdk, REST https://picsart.com/api-platform/docs/api-reference, CLI https://picsart.com/api-platform/docs/cli, MCP https://picsart.com/api-platform/docs/mcp
- CLI reference: https://picsart.github.io/picsart-mcp-cli-docs/guide/introduction