DeepSeek

Access 2 DeepSeek models through Mastra's model router. Authentication is handled automatically using the DEEPSEEK_API_KEY environment variable.

Learn more in the DeepSeek documentation.

DEEPSEEK_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: "deepseek/deepseek-chat"
});

// 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);
}

Models

2 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
deepseek/deepseek-chat	128K						$0.28	$0.42
deepseek/deepseek-reasoner	128K						$0.28	$0.42

Advanced Configuration

Custom Headers

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.deepseek.com",
    id: "deepseek/deepseek-chat",
    apiKey: process.env.DEEPSEEK_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
      ? "deepseek/deepseek-reasoner"
      : "deepseek/deepseek-chat";
  }
});

Provider Options

DeepSeek supports the following provider-specific options via the providerOptions parameter:

const response = await agent.generate("Hello!", {
  providerOptions: {
    deepseek: {
      // See available options in the table below
    }
  }
});

Available Options

thinking?:

{ type?: "enabled" | "disabled" | undefined; } | undefined