Access 39 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).

.env

```bash
OPENCODE_API_KEY=your-api-key
```

src/mastra/agents/my-agent.ts

```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);
}
```

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/gemini-3-flash` | 1.0M |  |  |  |  |  | $0.50 | $3 |
| `opencode/gemini-3.1-pro` | 1.0M |  |  |  |  |  | $2 | $12 |
| `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 |  |  |  |  |  | — | — |
| `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/hy3-preview-free` | 256K |  |  |  |  |  | — | — |
| `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-m2.5-free` | 205K |  |  |  |  |  | — | — |
| `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 |

39 available models

## Advanced configuration

### Custom headers

src/mastra/agents/my-agent.ts

```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

src/mastra/agents/my-agent.ts

```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";
  }
});
```