Boundless

Access 20 Boundless models through Mastra's model router. Authentication is handled automatically using the BOUNDLESS_API_KEY environment variable.

Learn more in the Boundless documentation.

.env

BOUNDLESS_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: "boundless/claude-fable-5.1"
});

// 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 Boundless documentation for details.

Models

20 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
boundless/claude-fable-5.1	262K						$10	$50
boundless/claude-opus-5	262K						$5	$25
boundless/claude-opus-5.5	1.0M						$4	$20
boundless/deepseek-v4-pro-0813	1.0M						$1	$2
boundless/deepseek-v4.1-flash	1.0M						$0.20	$1
boundless/dsv4	1.0M						$0.04	$0.21
boundless/glm-5.2	1.0M						$0.34	$2
boundless/glm-5.3	1.0M						$1	$4
boundless/glm-5.3-flash	1.0M						$0.12	$0.40
boundless/gpt-5.6-luna	262K						$0.20	$1
boundless/gpt-5.6-sol	262K						$2	$10
boundless/gpt-6-luna	1.1M						$0.10	$0.50
boundless/gpt-6-sol	1.1M						$2	$10
boundless/kimi-k3	1.0M						$2	$11
boundless/mimo-v2.6-flash	1.0M						$0.14	$0.28
boundless/mimo-v2.6-pro	1.0M						$0.43	$0.87
boundless/minimax-m3	1.0M						$0.28	$1
boundless/nemotron3-super	262K						$0.12	$0.52
boundless/qwen3.6	262K						$0.04	$0.35
boundless/qwen3.8-flash	1.0M						$0.15	$0.47

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.inference.boundless.network/v1",
    id: "boundless/claude-fable-5.1",
    apiKey: process.env.BOUNDLESS_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
      ? "boundless/qwen3.8-flash"
      : "boundless/claude-fable-5.1";
  }
});