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

# ![OpenCode Go logo](https://models.dev/logos/opencode-go.svg)OpenCode Go

Access 28 OpenCode Go models through Mastra's model router. Authentication is handled automatically using the `OPENCODE_API_KEY` environment variable.

Learn more in the [OpenCode Go documentation](https://opencode.ai/docs/zen).

```bash
OPENCODE_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: "opencode-go/deepseek-v4-flash"
});

// 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);
}
```

> **Note:** Mastra uses the OpenAI-compatible `/chat/completions` endpoint. Some provider-specific features may not be available. Check the [OpenCode Go documentation](https://opencode.ai/docs/zen) for details.

## Models

| Model                                      | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| ------------------------------------------ | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `opencode-go/deepseek-v4-flash`            | 1.0M    |       |           |       |       |       | $0.22      | $0.66       |
| `opencode-go/deepseek-v4-flash-vision-exp` | 1.0M    |       |           |       |       |       | $0.22      | $0.66       |
| `opencode-go/deepseek-v4-pro`              | 1.0M    |       |           |       |       |       | $0.66      | $2          |
| `opencode-go/glm-5.1`                      | 203K    |       |           |       |       |       | $1         | $4          |
| `opencode-go/glm-5.2`                      | 1.0M    |       |           |       |       |       | $1         | $4          |
| `opencode-go/glm-5.3`                      | 1.0M    |       |           |       |       |       | $1         | $4          |
| `opencode-go/gpt-5.6-luna`                 | 1.1M    |       |           |       |       |       | $0.20      | $1          |
| `opencode-go/grok-4.5`                     | 500K    |       |           |       |       |       | $2         | $6          |
| `opencode-go/hy3`                          | 256K    |       |           |       |       |       | $0.02      | $0.07       |
| `opencode-go/kimi-k2.6`                    | 262K    |       |           |       |       |       | $0.95      | $4          |
| `opencode-go/kimi-k2.7-code`               | 262K    |       |           |       |       |       | $0.95      | $4          |
| `opencode-go/kimi-k3`                      | 1.0M    |       |           |       |       |       | $3         | $15         |
| `opencode-go/mimo-v2.5`                    | 1.0M    |       |           |       |       |       | $0.14      | $0.28       |
| `opencode-go/mimo-v2.5-pro`                | 1.0M    |       |           |       |       |       | $0.43      | $0.87       |
| `opencode-go/minimax-m2.7`                 | 205K    |       |           |       |       |       | $0.30      | $1          |
| `opencode-go/minimax-m3`                   | 1.0M    |       |           |       |       |       | $0.30      | $1          |
| `opencode-go/muse-spark-1.2-contributor`   | 1.0M    |       |           |       |       |       | $0.10      | $0.20       |
| `opencode-go/ox-alpha-free`                | 1.0M    |       |           |       |       |       | —          | —           |
| `opencode-go/qwen3.6-plus`                 | 1.0M    |       |           |       |       |       | $0.50      | $3          |
| `opencode-go/qwen3.7-max`                  | 1.0M    |       |           |       |       |       | $3         | $8          |
| `opencode-go/qwen3.7-plus`                 | 1.0M    |       |           |       |       |       | $0.40      | $2          |
| `opencode-go/qwen3.8-max`                  | 1.0M    |       |           |       |       |       | $2         | $6          |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://opencode.ai/zen/go/v1",
    id: "opencode-go/deepseek-v4-flash",
    apiKey: process.env.OPENCODE_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
      ? "opencode-go/qwen3.8-max"
      : "opencode-go/deepseek-v4-flash";
  }
});
```