Together AI

Access 6 Together AI models through Mastra's model router. Authentication is handled automatically using the TOGETHER_API_KEY environment variable.

Learn more in the Together AI documentation.

TOGETHER_API_KEY=your-api-key

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

const agent = new Agent({
  name: "my-agent",
  instructions: "You are a helpful assistant",
  model: "togetherai/Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8"
});

// 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 Together AI documentation for details.

Models

6 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
togetherai/deepseek-ai/DeepSeek-R1	164K						$3	$7
togetherai/deepseek-ai/DeepSeek-V3	131K						$1	$1
togetherai/meta-llama/Llama-3.3-70B-Instruct-Turbo	131K						$0.88	$0.88
togetherai/moonshotai/Kimi-K2-Instruct	131K						$1	$3
togetherai/openai/gpt-oss-120b	131K						$0.15	$0.60
togetherai/Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8	262K						$2	$2

Advanced Configuration

Custom Headers

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://api.together.xyz/v1",
    id: "togetherai/Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8",
    apiKey: process.env.TOGETHER_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
      ? "togetherai/openai/gpt-oss-120b"
      : "togetherai/Qwen/Qwen3-Coder-480B-A35B-Instruct-FP8";
  }
});

Direct Provider Installation

This provider can also be installed directly as a standalone package, which can be used instead of the Mastra model router string. View the package documentation for more details.

npm install @ai-sdk/togetherai

For detailed provider-specific documentation, see the AI SDK Together AI provider docs.