Volcengine Ark

Access 15 Volcengine Ark models through Mastra's model router. Authentication is handled automatically using the ARK_API_KEY environment variable.

Learn more in the Volcengine Ark documentation.

.env

ARK_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: "volcengine/deepseek-v4-flash-ga-260731"
});

// 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 Volcengine Ark documentation for details.

Models

15 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
volcengine/deepseek-v4-flash-ga-260731	1.0M						$0.45	$1
volcengine/deepseek-v4-pro-ga-260813	1.0M						$1	$4
volcengine/doubao-seed-1-6-251015	256K						$0.12	$1
volcengine/doubao-seed-1-6-flash-250828	256K						$0.02	$0.22
volcengine/doubao-seed-1-6-vision-250815	256K						$0.12	$1
volcengine/doubao-seed-1-8-251228	256K						$0.12	$1
volcengine/doubao-seed-2-0-code-preview-260215	262K						$0.47	$2
volcengine/doubao-seed-2-0-lite-260428	256K						$0.09	$0.53
volcengine/doubao-seed-2-0-mini-260428	256K						$0.03	$0.30
volcengine/doubao-seed-2-0-pro-260215	256K						$0.47	$2
volcengine/doubao-seed-2-1-pro-260628	256K						$0.89	$4
volcengine/doubao-seed-2-1-turbo-260628	256K						$0.45	$2
volcengine/doubao-seed-character-260628	256K						$0.12	$0.30
volcengine/doubao-seed-evolving	256K						$0.89	$4
volcengine/glm-5-2-260617	1.0M						$1	$4

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://ark.cn-beijing.volces.com/api/v3",
    id: "volcengine/deepseek-v4-flash-ga-260731",
    apiKey: process.env.ARK_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
      ? "volcengine/glm-5-2-260617"
      : "volcengine/deepseek-v4-flash-ga-260731";
  }
});