Synthetic

Access 23 Synthetic models through Mastra's model router. Authentication is handled automatically using the SYNTHETIC_API_KEY environment variable.

Learn more in the Synthetic documentation.

SYNTHETIC_API_KEY=your-api-key

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

const agent = new Agent({
  name: "my-agent",
  instructions: "You are a helpful assistant",
  model: "synthetic/hf:MiniMaxAI/MiniMax-M2"
});

// 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 Synthetic documentation for details.

Models

23 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
synthetic/hf:deepseek-ai/DeepSeek-R1	128K						$0.55	$2
synthetic/hf:deepseek-ai/DeepSeek-R1-0528	128K						$3	$8
synthetic/hf:deepseek-ai/DeepSeek-V3	128K						$1	$1
synthetic/hf:deepseek-ai/DeepSeek-V3-0324	128K						$1	$1
synthetic/hf:deepseek-ai/DeepSeek-V3.1	128K						$0.56	$2
synthetic/hf:deepseek-ai/DeepSeek-V3.1-Terminus	128K						$1	$1
synthetic/hf:meta-llama/Llama-3.1-405B-Instruct	128K						$3	$3
synthetic/hf:meta-llama/Llama-3.1-70B-Instruct	128K						$0.90	$0.90
synthetic/hf:meta-llama/Llama-3.1-8B-Instruct	128K						$0.20	$0.20
synthetic/hf:meta-llama/Llama-3.3-70B-Instruct	128K						$0.90	$0.90
synthetic/hf:meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8	524K						$0.22	$0.88
synthetic/hf:meta-llama/Llama-4-Scout-17B-16E-Instruct	328K						$0.15	$0.60
synthetic/hf:MiniMaxAI/MiniMax-M2	197K						$0.55	$2
synthetic/hf:moonshotai/Kimi-K2-Instruct	128K						$0.60	$3
synthetic/hf:moonshotai/Kimi-K2-Instruct-0905	262K						$1	$1
synthetic/hf:moonshotai/Kimi-K2-Thinking	262K						$0.55	$2
synthetic/hf:openai/gpt-oss-120b	128K						$0.10	$0.10
synthetic/hf:Qwen/Qwen2.5-Coder-32B-Instruct	33K						$0.80	$0.80
synthetic/hf:Qwen/Qwen3-235B-A22B-Instruct-2507	256K						$0.20	$0.60
synthetic/hf:Qwen/Qwen3-235B-A22B-Thinking-2507	256K						$0.65	$3
synthetic/hf:Qwen/Qwen3-Coder-480B-A35B-Instruct	256K						$2	$2
synthetic/hf:zai-org/GLM-4.5	128K						$0.55	$2
synthetic/hf:zai-org/GLM-4.6	200K						$0.55	$2

Advanced Configuration

Custom Headers

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://api.synthetic.new/v1",
    id: "synthetic/hf:MiniMaxAI/MiniMax-M2",
    apiKey: process.env.SYNTHETIC_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
      ? "synthetic/hf:zai-org/GLM-4.6"
      : "synthetic/hf:MiniMaxAI/MiniMax-M2";
  }
});