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

Access 29 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-M2"
});

// 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:deepseek-ai/DeepSeek-R1`                           | 128K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:deepseek-ai/DeepSeek-R1-0528`                      | 128K    |       |           |       |       |       | $3         | $8          |
| `synthetic/hf:deepseek-ai/DeepSeek-V3`                           | 128K    |       |           |       |       |       | $1         | $1          |
| `synthetic/hf:deepseek-ai/DeepSeek-V3-0324`                      | 128K    |       |           |       |       |       | $1         | $1          |
| `synthetic/hf:deepseek-ai/DeepSeek-V3.1`                         | 128K    |       |           |       |       |       | $0.56      | $2          |
| `synthetic/hf:deepseek-ai/DeepSeek-V3.1-Terminus`                | 128K    |       |           |       |       |       | $1         | $1          |
| `synthetic/hf:deepseek-ai/DeepSeek-V3.2`                         | 163K    |       |           |       |       |       | $0.27      | $0.40       |
| `synthetic/hf:meta-llama/Llama-3.1-405B-Instruct`                | 128K    |       |           |       |       |       | $3         | $3          |
| `synthetic/hf:meta-llama/Llama-3.1-70B-Instruct`                 | 128K    |       |           |       |       |       | $0.90      | $0.90       |
| `synthetic/hf:meta-llama/Llama-3.1-8B-Instruct`                  | 128K    |       |           |       |       |       | $0.20      | $0.20       |
| `synthetic/hf:meta-llama/Llama-3.3-70B-Instruct`                 | 128K    |       |           |       |       |       | $0.90      | $0.90       |
| `synthetic/hf:meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8` | 524K    |       |           |       |       |       | $0.22      | $0.88       |
| `synthetic/hf:meta-llama/Llama-4-Scout-17B-16E-Instruct`         | 328K    |       |           |       |       |       | $0.15      | $0.60       |
| `synthetic/hf:MiniMaxAI/MiniMax-M2`                              | 197K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:MiniMaxAI/MiniMax-M2.1`                            | 205K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:MiniMaxAI/MiniMax-M2.5`                            | 191K    |       |           |       |       |       | $0.60      | $3          |
| `synthetic/hf:moonshotai/Kimi-K2-Instruct-0905`                  | 262K    |       |           |       |       |       | $1         | $1          |
| `synthetic/hf:moonshotai/Kimi-K2-Thinking`                       | 262K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:moonshotai/Kimi-K2.5`                              | 262K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:nvidia/Kimi-K2.5-NVFP4`                            | 262K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:openai/gpt-oss-120b`                               | 128K    |       |           |       |       |       | $0.10      | $0.10       |
| `synthetic/hf:Qwen/Qwen2.5-Coder-32B-Instruct`                   | 33K     |       |           |       |       |       | $0.80      | $0.80       |
| `synthetic/hf:Qwen/Qwen3-235B-A22B-Instruct-2507`                | 256K    |       |           |       |       |       | $0.20      | $0.60       |
| `synthetic/hf:Qwen/Qwen3-235B-A22B-Thinking-2507`                | 256K    |       |           |       |       |       | $0.65      | $3          |
| `synthetic/hf:Qwen/Qwen3-Coder-480B-A35B-Instruct`               | 256K    |       |           |       |       |       | $2         | $2          |
| `synthetic/hf:Qwen/Qwen3.5-397B-A17B`                            | 262K    |       |           |       |       |       | $0.60      | $3          |
| `synthetic/hf:zai-org/GLM-4.6`                                   | 200K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:zai-org/GLM-4.7`                                   | 200K    |       |           |       |       |       | $0.55      | $2          |
| `synthetic/hf:zai-org/GLM-4.7-Flash`                             | 197K    |       |           |       |       |       | $0.06      | $0.40       |

## 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-M2",
    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-4.7-Flash"
      : "synthetic/hf:MiniMaxAI/MiniMax-M2";
  }
});
```