STACKIT

Access 8 STACKIT models through Mastra's model router. Authentication is handled automatically using the STACKIT_API_KEY environment variable.

Learn more in the STACKIT documentation.

.env

STACKIT_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: "stackit/e5-mistral-7b"
});

// 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 STACKIT documentation for details.

Models

8 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
stackit/e5-mistral-7b	4K						$0.02	$0.02
stackit/gemma-3-27b	37K						$0.53	$0.77
stackit/gpt-oss-120b	128K						$0.53	$0.77
stackit/llama-3.1-8b	128K						$0.18	$0.30
stackit/llama-3.3-70b	128K						$0.53	$0.77
stackit/mistral-nemo	128K						$0.53	$0.77
stackit/qwen3-vl-235b	218K						$2	$2
stackit/qwen3-vl-embedding-8b	32K						$0.09	$0.09

Advanced Configuration

Custom Headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.openai-compat.model-serving.eu01.onstackit.cloud/v1",
    id: "stackit/e5-mistral-7b",
    apiKey: process.env.STACKIT_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
      ? "stackit/qwen3-vl-embedding-8b"
      : "stackit/e5-mistral-7b";
  }
});