submodel

Access 9 submodel models through Mastra's model router. Authentication is handled automatically using the SUBMODEL_INSTAGEN_ACCESS_KEY environment variable.

Learn more in the submodel documentation.

SUBMODEL_INSTAGEN_ACCESS_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: "submodel/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 submodel documentation for details.

:::

Models

<ProviderModelsTable models={[ { "model": "submodel/deepseek-ai/DeepSeek-R1-0528", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": true, "contextWindow": 75000, "maxOutput": 163840, "inputCost": 0.5, "outputCost": 2.15 }, { "model": "submodel/deepseek-ai/DeepSeek-V3-0324", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": false, "contextWindow": 75000, "maxOutput": 163840, "inputCost": 0.2, "outputCost": 0.8 }, { "model": "submodel/deepseek-ai/DeepSeek-V3.1", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": true, "contextWindow": 75000, "maxOutput": 163840, "inputCost": 0.2, "outputCost": 0.8 }, { "model": "submodel/openai/gpt-oss-120b", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": true, "contextWindow": 131072, "maxOutput": 32768, "inputCost": 0.1, "outputCost": 0.5 }, { "model": "submodel/Qwen/Qwen3-235B-A22B-Instruct-2507", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": false, "contextWindow": 262144, "maxOutput": 131072, "inputCost": 0.2, "outputCost": 0.3 }, { "model": "submodel/Qwen/Qwen3-235B-A22B-Thinking-2507", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": true, "contextWindow": 262144, "maxOutput": 131072, "inputCost": 0.2, "outputCost": 0.6 }, { "model": "submodel/Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": false, "contextWindow": 262144, "maxOutput": 262144, "inputCost": 0.2, "outputCost": 0.8 }, { "model": "submodel/zai-org/GLM-4.5-Air", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": false, "contextWindow": 131072, "maxOutput": 131072, "inputCost": 0.1, "outputCost": 0.5 }, { "model": "submodel/zai-org/GLM-4.5-FP8", "imageInput": false, "audioInput": false, "videoInput": false, "toolUsage": true, "reasoning": true, "contextWindow": 131072, "maxOutput": 131072, "inputCost": 0.2, "outputCost": 0.8 } ]} />

Advanced configuration

Custom headers

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://llm.submodel.ai/v1",
    id: "submodel/Qwen/Qwen3-235B-A22B-Instruct-2507",
    apiKey: process.env.SUBMODEL_INSTAGEN_ACCESS_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
      ? "submodel/zai-org/GLM-4.5-FP8"
      : "submodel/Qwen/Qwen3-235B-A22B-Instruct-2507";
  }
});