AgentRouter

Access 20 AgentRouter models through Mastra's model router. Authentication is handled automatically using the AGENTROUTER_API_KEY environment variable.

Learn more in the AgentRouter documentation.

AGENTROUTER_API_KEY=your-api-key

import { Agent } from "@mastra/core/agent";

const agent = new Agent({
  id: "my-agent",
  name: "My Agent",
  instructions: "You are a helpful assistant",
  model: "agentrouter/claude-3-5-haiku-20241022"
});

// 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 AgentRouter documentation for details.

Models

20 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
agentrouter/claude-3-5-haiku-20241022	200K						$1	$5
agentrouter/claude-3-5-sonnet-20240620	200K						$3	$15
agentrouter/claude-3-5-sonnet-20241022	200K						$3	$15
agentrouter/claude-3-7-sonnet-20250219	200K						$3	$15
agentrouter/claude-3-7-sonnet-20250219-thinking	200K						$3	$15
agentrouter/claude-haiku-4-5-20251001	200K						$2	$4
agentrouter/claude-opus-4-20250514	200K						$21	$105
agentrouter/claude-opus-4-20250514-thinking	200K						$2	$10
agentrouter/claude-sonnet-4-20250514	200K						$3	$15
agentrouter/claude-sonnet-4-20250514-thinking	200K						$2	$10
agentrouter/claude-sonnet-4-5-20250929	1.0M						$6	$30
agentrouter/deepseek-r1-0528	128K						$0.30	$0.04
agentrouter/deepseek-v3.1	128K						$0.30	$0.04
agentrouter/deepseek-v3.2	128K						$0.30	$0.04
agentrouter/gemini-3-pro-preview	1.0M						$2	$8
agentrouter/glm-4.5	131K						$0.00	—
agentrouter/glm-4.6	205K						$0.00	—
agentrouter/gpt-5	1.3M						—	—
agentrouter/gpt-5.1	400K						$2	$2
agentrouter/kimi-k2-thinking	262K						$0.00	—

Advanced Configuration

Custom Headers

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://agentrouter.org/v1",
    id: "agentrouter/claude-3-5-haiku-20241022",
    apiKey: process.env.AGENTROUTER_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});

Dynamic Model Selection

const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "agentrouter/kimi-k2-thinking"
      : "agentrouter/claude-3-5-haiku-20241022";
  }
});