LowRouter

Access 31 LowRouter models through Mastra's model router. Authentication is handled automatically using the LOWROUTER_API_KEY environment variable.

Learn more in the LowRouter documentation.

.env

LOWROUTER_API_KEY=your-api-key

src/mastra/agents/my-agent.ts

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

const agent = new Agent({
  id: "my-agent",
  name: "My Agent",
  instructions: "You are a helpful assistant",
  model: "lowrouter/auto/mistralai/codestral-2508"
});

// 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);
}

备注

Mastra uses the OpenAI-compatible /chat/completions endpoint. Some provider-specific features may not be available. Check the LowRouter documentation for details.

Models

31 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
lowrouter/auto/mistralai/codestral-2508	128K						$0.31	$0.94
lowrouter/auto/mistralai/ministral-14b-2512	262K						$0.21	$0.21
lowrouter/auto/mistralai/ministral-3b-2512	262K						$0.10	$0.10
lowrouter/auto/mistralai/ministral-8b-2512	262K						$0.16	$0.16
lowrouter/auto/mistralai/mistral-large-2512	262K						$0.52	$2
lowrouter/auto/mistralai/mistral-large-4	524K						$0.71	$2
lowrouter/auto/mistralai/mistral-medium-3.5	262K						$2	$8
lowrouter/auto/mistralai/mistral-small-2603	256K						$0.16	$0.63
lowrouter/auto/openai/gpt-4.1	1.0M						$2	$8
lowrouter/auto/openai/gpt-4.1-mini	1.0M						$0.40	$2
lowrouter/auto/openai/gpt-4o	128K						$3	$10
lowrouter/auto/openai/gpt-4o-mini	128K						$0.15	$0.60
lowrouter/auto/openai/gpt-5	400K						$1	$10
lowrouter/auto/openai/gpt-5-mini	400K						$0.25	$2
lowrouter/auto/openai/gpt-5-nano	400K						$0.05	$0.40
lowrouter/auto/openai/gpt-5.2	400K						$2	$14
lowrouter/auto/openai/gpt-5.4	1.1M						$3	$15
lowrouter/auto/openai/gpt-5.4-mini	400K						$0.75	$5
lowrouter/auto/openai/gpt-5.5	1.1M						$5	$30
lowrouter/auto/openai/gpt-5.6-luna	1.1M						$0.20	$1
lowrouter/auto/openai/gpt-5.6-sol	1.1M						$4	$20
lowrouter/auto/openai/gpt-5.6-terra	1.1M						$2	$12
lowrouter/auto/openai/gpt-6-astra	1.1M						$10	$50
lowrouter/auto/openai/gpt-6-luna	1.1M						$0.10	$0.50
lowrouter/auto/openai/gpt-6-sol	1.1M						$2	$10
lowrouter/auto/openai/gpt-6.1-sol	1.1M						$2	$10
lowrouter/auto/openai/gpt-oss-120b	131K						$0.17	$0.68
lowrouter/auto/openai/gpt-oss-20b	131K						$0.11	$0.47
lowrouter/auto/openai/gpt-oss-safeguard-120b	131K						$0.18	$0.73
lowrouter/auto/openai/gpt-oss-safeguard-20b	131K						$0.08	$0.24
lowrouter/auto/openai/o3	200K						$2	$8

Model availability, capabilities, context windows, and pricing are sourced from models.dev and may change.

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.lowrouter.ai/v1",
    id: "lowrouter/auto/mistralai/codestral-2508",
    apiKey: process.env.LOWROUTER_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});

Dynamic model selection

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "lowrouter/auto/openai/o3"
      : "lowrouter/auto/mistralai/codestral-2508";
  }
});