> Discover all available pages from the documentation index: https://mastra.zisheng.pro/en/llms.txt

# ![Synthetic logo](https://models.dev/logos/synthetic.svg)Synthetic

Access 8 Synthetic models through Mastra's model router. Authentication is handled automatically using the `SYNTHETIC_API_KEY` environment variable.

Learn more in the [Synthetic documentation](https://synthetic.new/pricing).

```bash
SYNTHETIC_API_KEY=your-api-key
```

```typescript
import { Agent } from "@mastra/core/agent";

const agent = new Agent({
  id: "my-agent",
  name: "My Agent",
  instructions: "You are a helpful assistant",
  model: "synthetic/hf:MiniMaxAI/MiniMax-M3"
});

// Generate a response
const response = await agent.generate("Hello!");

// Stream a response
const stream = await agent.stream("Tell me a story");
for await (const chunk of stream) {
  console.log(chunk);
}
```

> **Info:** Mastra uses the OpenAI-compatible `/chat/completions` endpoint. Some provider-specific features may not be available. Check the [Synthetic documentation](https://synthetic.new/pricing) for details.

## Models

| Model                                                         | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| ------------------------------------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `synthetic/hf:MiniMaxAI/MiniMax-M3`                           | 524K    |       |           |       |       |       | $0.60      | $1          |
| `synthetic/hf:moonshotai/Kimi-K2.7-Code`                      | 262K    |       |           |       |       |       | $0.95      | $4          |
| `synthetic/hf:moonshotai/Kimi-K3`                             | 524K    |       |           |       |       |       | $3         | $15         |
| `synthetic/hf:nvidia/NVIDIA-Nemotron-3-Super-120B-A12B-NVFP4` | 262K    |       |           |       |       |       | $0.30      | $1          |
| `synthetic/hf:openai/gpt-oss-120b`                            | 131K    |       |           |       |       |       | $0.10      | $0.10       |
| `synthetic/hf:Qwen/Qwen3.6-27B`                               | 262K    |       |           |       |       |       | $0.45      | $4          |
| `synthetic/hf:zai-org/GLM-4.7-Flash`                          | 197K    |       |           |       |       |       | $0.10      | $0.50       |
| `synthetic/hf:zai-org/GLM-5.2`                                | 524K    |       |           |       |       |       | $1         | $4          |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.synthetic.new/openai/v1",
    id: "synthetic/hf:MiniMaxAI/MiniMax-M3",
    apiKey: process.env.SYNTHETIC_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});
```

### Dynamic model selection

```typescript
const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "synthetic/hf:zai-org/GLM-5.2"
      : "synthetic/hf:MiniMaxAI/MiniMax-M3";
  }
});
```