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 .
WANDB_API_KEY=your-api-key
import { Agent } from "@mastra/core";
const agent = new 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);
}
Mastra uses the OpenAI-compatible /chat/completions
endpoint. Some provider-specific features may not be available. Check the Weights & Biases documentation for details.
Models
Model | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
---|---|---|---|---|---|---|---|---|
wandb/moonshotai/Kimi-K2-Instruct | 128K | $1 | $4 | |||||
wandb/microsoft/Phi-4-mini-instruct | 128K | $0.08 | $0.35 | |||||
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/Qwen/Qwen3-235B-A22B-Instruct-2507 | 262K | $0.10 | $0.10 | |||||
wandb/Qwen/Qwen3-Coder-480B-A35B-Instruct | 262K | $1 | $2 | |||||
wandb/Qwen/Qwen3-235B-A22B-Thinking-2507 | 262K | $0.10 | $0.10 | |||||
wandb/deepseek-ai/DeepSeek-R1-0528 | 161K | $1 | $5 | |||||
wandb/deepseek-ai/DeepSeek-V3-0324 | 161K | $1 | $3 |
Advanced Configuration
Custom Headers
const agent = new Agent({
name: "custom-agent",
model: {
url: "https://api.inference.wandb.ai/v1/chat/completions",
modelId: "Qwen/Qwen3-235B-A22B-Instruct-2507",
apiKey: process.env.WANDB_API_KEY,
headers: {
"X-Custom-Header": "value"
}
}
});
Dynamic Model Selection
const agent = new Agent({
name: "dynamic-agent",
model: ({ runtimeContext }) => {
const useAdvanced = runtimeContext.task === "complex";
return useAdvanced
? "wandb/Qwen/Qwen3-235B-A22B-Instruct-2507"
: "wandb/Qwen/Qwen3-235B-A22B-Thinking-2507";
}
});