LLMTR

Access 32 LLMTR models through Mastra's model router. Authentication is handled automatically using the LLMTR_API_KEY environment variable.

Learn more in the LLMTR documentation.

.env

LLMTR_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: "llmtr/gemma-4"
});

// 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 LLMTR documentation for details.

Models

31 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
llmtr/gemma-4	131K						$2	$5
llmtr/google/gemini-2.5-flash-lite	1.0M						$0.10	$0.10
llmtr/magibu-11b-v8	8K						$0.10	$0.50
llmtr/meta/muse-spark-1.2-contributor	1.0M						$0.10	$0.20
llmtr/mimo/mimo-v2.5	1.0M						$0.14	$0.28
llmtr/mimo/mimo-v2.5-pro	1.0M						$0.43	$0.87
llmtr/mistral/voxtral-small-latest	32K						$0.10	$0.30
llmtr/muse-glimmer-30b-tr	131K						$2	$5
llmtr/perplexity/sonar-deep-research	128K						$2	$8
llmtr/poolside/laguna-xs-2.1	262K						—	—
llmtr/publicai/apertus-70b-instruct	66K						$0.82	$3
llmtr/publicai/apertus-8b-instruct	66K						$0.10	$0.20
llmtr/qwen/qwen-flash	1.0M						$0.05	$0.40
llmtr/qwen/qwen-plus	1.0M						$0.40	$1
llmtr/qwen/qwen3-coder-flash	1.0M						$0.30	$2
llmtr/qwen/qwen3-coder-plus	1.0M						$1	$5
llmtr/qwen/qwen3-max	256K						$1	$6
llmtr/qwen/qwen3-vl-plus	256K						$0.20	$2
llmtr/qwen/qwen3.5-397b-a17b	256K						$0.60	$4
llmtr/qwen/qwen3.5-plus	1.0M						$0.40	$2
llmtr/qwen/qwen3.6-flash	1.0M						$0.25	$2
llmtr/qwen/qwen3.6-plus	1.0M						$0.50	$3
llmtr/qwen/qwen3.7-plus	1.0M						$0.40	$2
llmtr/qwen3-6-35b	16K						$5	$10
llmtr/sakana/fugu-ultra	1.0M						$5	$30
llmtr/thinkingmachines/inkling	262K						$2	$5
llmtr/thinkingmachines/inkling-small	262K						$0.58	$1
llmtr/trendyol-asure-12b	41K						$0.10	$0.50
llmtr/upstage/solar-pro2	66K						$0.15	$0.60
llmtr/upstage/solar-pro3	131K						$0.15	$0.60
llmtr/upstage/solar-pro4	524K						$0.03	$0.12

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://llmtr.com/v1",
    id: "llmtr/gemma-4",
    apiKey: process.env.LLMTR_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
      ? "llmtr/upstage/solar-pro4"
      : "llmtr/gemma-4";
  }
});