# ![Weights & Biases logo](https://models.dev/logos/wandb.svg)Weights & Biases

Access 10 Weights & Biases models through Mastra's model router. Authentication is handled automatically using the `WANDB_API_KEY` environment variable.

Learn more in the [Weights & Biases documentation](https://weave-docs.wandb.ai).

```bash
WANDB_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: "wandb/Qwen/Qwen3-235B-A22B-Instruct-2507"
});

// 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 [Weights & Biases documentation](https://weave-docs.wandb.ai) for details.

## Models

| Model                                             | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
| ------------------------------------------------- | ------- | ----- | --------- | ----- | ----- | ----- | ---------- | ----------- |
| `wandb/deepseek-ai/DeepSeek-R1-0528`              | 161K    |       |           |       |       |       | $1         | $5          |
| `wandb/deepseek-ai/DeepSeek-V3-0324`              | 161K    |       |           |       |       |       | $1         | $3          |
| `wandb/meta-llama/Llama-3.1-8B-Instruct`          | 128K    |       |           |       |       |       | $0.22      | $0.22       |
| `wandb/meta-llama/Llama-3.3-70B-Instruct`         | 128K    |       |           |       |       |       | $0.71      | $0.71       |
| `wandb/meta-llama/Llama-4-Scout-17B-16E-Instruct` | 64K     |       |           |       |       |       | $0.17      | $0.66       |
| `wandb/microsoft/Phi-4-mini-instruct`             | 128K    |       |           |       |       |       | $0.08      | $0.35       |
| `wandb/moonshotai/Kimi-K2-Instruct`               | 128K    |       |           |       |       |       | $1         | $4          |
| `wandb/Qwen/Qwen3-235B-A22B-Instruct-2507`        | 262K    |       |           |       |       |       | $0.10      | $0.10       |
| `wandb/Qwen/Qwen3-235B-A22B-Thinking-2507`        | 262K    |       |           |       |       |       | $0.10      | $0.10       |
| `wandb/Qwen/Qwen3-Coder-480B-A35B-Instruct`       | 262K    |       |           |       |       |       | $1         | $2          |

## Advanced Configuration

### Custom Headers

```typescript
const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.inference.wandb.ai/v1",
    id: "wandb/Qwen/Qwen3-235B-A22B-Instruct-2507",
    apiKey: process.env.WANDB_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
      ? "wandb/moonshotai/Kimi-K2-Instruct"
      : "wandb/Qwen/Qwen3-235B-A22B-Instruct-2507";
  }
});
```