Nebius AI Studio

Access 15 Nebius AI Studio models through Mastra's model router. Authentication is handled automatically using the NEBIUS_API_KEY environment variable.

Learn more in the Nebius AI Studio documentation.

NEBIUS_API_KEY=your-api-key

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

const agent = new Agent({
  name: "my-agent",
  instructions: "You are a helpful assistant",
  model: "nebius/NousResearch/hermes-4-405b"
});

// 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 Nebius AI Studio documentation for details.

Models

15 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
nebius/deepseek-ai/deepseek-v3	131K						$0.50	$2
nebius/meta-llama/llama-3_1-405b-instruct	131K						$1	$3
nebius/meta-llama/llama-3.3-70b-instruct-base	131K						$0.13	$0.40
nebius/meta-llama/llama-3.3-70b-instruct-fast	131K						$0.25	$0.75
nebius/moonshotai/kimi-k2-instruct	131K						$0.50	$2
nebius/NousResearch/hermes-4-405b	131K						$1	$3
nebius/NousResearch/hermes-4-70b	131K						$0.13	$0.40
nebius/nvidia/llama-3_1-nemotron-ultra-253b-v1	131K						$0.60	$2
nebius/openai/gpt-oss-120b	131K						$0.15	$0.60
nebius/openai/gpt-oss-20b	131K						$0.05	$0.20
nebius/qwen/qwen3-235b-a22b-instruct-2507	262K						$0.20	$0.60
nebius/qwen/qwen3-235b-a22b-thinking-2507	262K						$0.20	$0.80
nebius/qwen/qwen3-coder-480b-a35b-instruct	262K						$0.40	$2
nebius/zai-org/glm-4.5	131K						$0.60	$2
nebius/zai-org/glm-4.5-air	131K						$0.20	$1

Advanced Configuration

Custom Headers

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://api.studio.nebius.com/v1/",
    id: "nebius/NousResearch/hermes-4-405b",
    apiKey: process.env.NEBIUS_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
      ? "nebius/zai-org/glm-4.5-air"
      : "nebius/NousResearch/hermes-4-405b";
  }
});