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

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

Access 93 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);
}
```

> **Note:** 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-fable-5`                  | 1.0M    |       |           |       |       |       | $10        | $50         |
| `opencode/claude-haiku-4-5`                | 200K    |       |           |       |       |       | $1         | $5          |
| `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-opus-4-8`                 | 1.0M    |       |           |       |       |       | $5         | $25         |
| `opencode/claude-opus-5`                   | 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/claude-sonnet-5`                 | 1.0M    |       |           |       |       |       | $2         | $10         |
| `opencode/deepseek-v4-flash`               | 1.0M    |       |           |       |       |       | $0.14      | $0.28       |
| `opencode/deepseek-v4-pro`                 | 1.0M    |       |           |       |       |       | $2         | $4          |
| `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/gemini-3.5-flash-lite`           | 1.0M    |       |           |       |       |       | $0.30      | $3          |
| `opencode/gemini-3.6-flash`                | 1.0M    |       |           |       |       |       | $2         | $8          |
| `opencode/gemini-3.7-flash`                | 1.0M    |       |           |       |       |       | $2         | $8          |
| `opencode/glm-5`                           | 205K    |       |           |       |       |       | $1         | $3          |
| `opencode/glm-5.1`                         | 205K    |       |           |       |       |       | $1         | $4          |
| `opencode/glm-5.2`                         | 1.0M    |       |           |       |       |       | $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/gpt-5.6-luna`                    | 1.1M    |       |           |       |       |       | $0.20      | $1          |
| `opencode/gpt-5.6-sol`                     | 1.1M    |       |           |       |       |       | $2         | $10         |
| `opencode/gpt-5.6-terra`                   | 1.1M    |       |           |       |       |       | $3         | $15         |
| `opencode/grok-4.5`                        | 500K    |       |           |       |       |       | $2         | $6          |
| `opencode/grok-4.6`                        | 500K    |       |           |       |       |       | $2         | $6          |
| `opencode/grok-build-0.1`                  | 256K    |       |           |       |       |       | $1         | $2          |
| `opencode/hy3-free`                        | 190K    |       |           |       |       |       | —          | —           |
| `opencode/kimi-k2.5`                       | 262K    |       |           |       |       |       | $0.60      | $3          |
| `opencode/kimi-k2.6`                       | 262K    |       |           |       |       |       | $0.95      | $4          |
| `opencode/kimi-k2.7-code`                  | 262K    |       |           |       |       |       | $0.95      | $4          |
| `opencode/kimi-k3`                         | 1.0M    |       |           |       |       |       | $3         | $15         |
| `opencode/mimo-v2.5-free`                  | 200K    |       |           |       |       |       | —          | —           |
| `opencode/minimax-m2.5`                    | 205K    |       |           |       |       |       | $0.30      | $1          |
| `opencode/minimax-m2.7`                    | 205K    |       |           |       |       |       | $0.30      | $1          |
| `opencode/minimax-m3`                      | 512K    |       |           |       |       |       | $0.30      | $1          |
| `opencode/muse-spark-1.2`                  | 1.0M    |       |           |       |       |       | $1         | $4          |
| `opencode/muse-spark-1.2-contributor-free` | 1.0M    |       |           |       |       |       | —          | —           |
| `opencode/nemotron-3-ultra-free`           | 1.0M    |       |           |       |       |       | —          | —           |
| `opencode/nemotron-3.5-lightning-free`     | 262K    |       |           |       |       |       | —          | —           |
| `opencode/qwen3.5-plus`                    | 262K    |       |           |       |       |       | $0.20      | $1          |
| `opencode/qwen3.6-plus`                    | 262K    |       |           |       |       |       | $0.50      | $3          |
| `opencode/x-preview-f-free`                | 1.0M    |       |           |       |       |       | —          | —           |

## 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/x-preview-f-free"
      : "opencode/big-pickle";
  }
});
```