Upstage

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

Learn more in the Upstage documentation.

UPSTAGE_API_KEY=your-api-key

import { Agent } from "@mastra/core";

const agent = new Agent({
  name: "my-agent",
  instructions: "You are a helpful assistant",
  model: "upstage/solar-mini",
});

// 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);
}

OpenAI Compatibility

Mastra uses the OpenAI-compatible /chat/completions endpoint. Some provider-specific features may not be available. Check the Upstage documentation for details.

Models

Model	Image	Audio	Video	Tools	Streaming	Context Window
upstage/solar-mini	✗	✗	✗	✓	✗	32,768
upstage/solar-pro2	✗	✗	✗	✓	✗	65,536

Advanced Configuration

Custom Headers

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://api.upstage.ai",
    modelId: "solar-mini",
    apiKey: process.env.UPSTAGE_API_KEY,
    headers: {
      "X-Custom-Header": "value",
    },
  },
});

Dynamic Model Selection

const agent = new Agent({
  name: "dynamic-agent",
  model: ({ runtimeContext }) => {
    const useAdvanced = runtimeContext.task === "complex";
    return useAdvanced ? "upstage/solar-pro2" : "upstage/solar-mini";
  },
});