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

Access 40 OpenCode Zen models through Mastra's model router. Authentication is handled automatically using the `OPENCODE_API_KEY` environment variable.

Learn more in the [OpenCode Zen 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/big-pickle"
});

// 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 [OpenCode Zen documentation](https://opencode.ai/docs/zen) for details.

## Models

| Model                             | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| --------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `opencode/big-pickle`             | 200K    |       |           |       |       |       | —          | —           |
| `opencode/claude-haiku-4-5`       | 200K    |       |           |       |       |       | $1         | $5          |
| `opencode/claude-opus-4-1`        | 200K    |       |           |       |       |       | $15        | $75         |
| `opencode/claude-opus-4-5`        | 200K    |       |           |       |       |       | $5         | $25         |
| `opencode/claude-opus-4-6`        | 1.0M    |       |           |       |       |       | $5         | $25         |
| `opencode/claude-opus-4-7`        | 1.0M    |       |           |       |       |       | $5         | $25         |
| `opencode/claude-sonnet-4`        | 1.0M    |       |           |       |       |       | $3         | $15         |
| `opencode/claude-sonnet-4-5`      | 1.0M    |       |           |       |       |       | $3         | $15         |
| `opencode/claude-sonnet-4-6`      | 1.0M    |       |           |       |       |       | $3         | $15         |
| `opencode/deepseek-v4-flash-free` | 200K    |       |           |       |       |       | —          | —           |
| `opencode/gemini-3-flash`         | 1.0M    |       |           |       |       |       | $0.50      | $3          |
| `opencode/gemini-3.1-pro`         | 1.0M    |       |           |       |       |       | $2         | $12         |
| `opencode/gemini-3.5-flash`       | 1.0M    |       |           |       |       |       | $2         | $9          |
| `opencode/glm-5`                  | 205K    |       |           |       |       |       | $1         | $3          |
| `opencode/glm-5.1`                | 205K    |       |           |       |       |       | $1         | $4          |
| `opencode/gpt-5`                  | 400K    |       |           |       |       |       | $1         | $9          |
| `opencode/gpt-5-codex`            | 400K    |       |           |       |       |       | $1         | $9          |
| `opencode/gpt-5-nano`             | 400K    |       |           |       |       |       | $0.05      | $0.40       |
| `opencode/gpt-5.1`                | 400K    |       |           |       |       |       | $1         | $9          |
| `opencode/gpt-5.1-codex`          | 400K    |       |           |       |       |       | $1         | $9          |
| `opencode/gpt-5.1-codex-max`      | 400K    |       |           |       |       |       | $1         | $10         |
| `opencode/gpt-5.1-codex-mini`     | 400K    |       |           |       |       |       | $0.25      | $2          |
| `opencode/gpt-5.2`                | 400K    |       |           |       |       |       | $2         | $14         |
| `opencode/gpt-5.2-codex`          | 400K    |       |           |       |       |       | $2         | $14         |
| `opencode/gpt-5.3-codex`          | 400K    |       |           |       |       |       | $2         | $14         |
| `opencode/gpt-5.3-codex-spark`    | 128K    |       |           |       |       |       | $2         | $14         |
| `opencode/gpt-5.4`                | 1.1M    |       |           |       |       |       | $3         | $15         |
| `opencode/gpt-5.4-mini`           | 400K    |       |           |       |       |       | $0.75      | $5          |
| `opencode/gpt-5.4-nano`           | 400K    |       |           |       |       |       | $0.20      | $1          |
| `opencode/gpt-5.4-pro`            | 1.1M    |       |           |       |       |       | $30        | $180        |
| `opencode/gpt-5.5`                | 1.1M    |       |           |       |       |       | $5         | $30         |
| `opencode/gpt-5.5-pro`            | 1.1M    |       |           |       |       |       | $30        | $180        |
| `opencode/grok-build-0.1`         | 256K    |       |           |       |       |       | $1         | $2          |
| `opencode/kimi-k2.5`              | 262K    |       |           |       |       |       | $0.60      | $3          |
| `opencode/kimi-k2.6`              | 262K    |       |           |       |       |       | $0.95      | $4          |
| `opencode/minimax-m2.5`           | 205K    |       |           |       |       |       | $0.30      | $1          |
| `opencode/minimax-m2.7`           | 205K    |       |           |       |       |       | $0.30      | $1          |
| `opencode/nemotron-3-super-free`  | 205K    |       |           |       |       |       | —          | —           |
| `opencode/qwen3.5-plus`           | 262K    |       |           |       |       |       | $0.20      | $1          |
| `opencode/qwen3.6-plus`           | 262K    |       |           |       |       |       | $0.50      | $3          |

## Advanced configuration

### Custom headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://opencode.ai/zen/v1",
    id: "opencode/big-pickle",
    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/qwen3.6-plus"
      : "opencode/big-pickle";
  }
});
```