Fireworks AI

Access 10 Fireworks AI models through Mastra's model router. Authentication is handled automatically using the FIREWORKS_API_KEY environment variable.

Learn more in the Fireworks AI documentation.

FIREWORKS_API_KEY=your-api-key

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

const agent = new Agent({
  name: "my-agent",
  instructions: "You are a helpful assistant",
  model: "fireworks-ai/accounts/fireworks/models/deepseek-r1-0528"
});

// 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 Fireworks AI documentation for details.

Models

11 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
fireworks-ai/accounts/fireworks/models/deepseek-r1-0528	160K						$3	$8
fireworks-ai/accounts/fireworks/models/deepseek-v3-0324	160K						$0.90	$0.90
fireworks-ai/accounts/fireworks/models/deepseek-v3p1	164K						$0.56	$2
fireworks-ai/accounts/fireworks/models/glm-4p5	131K						$0.55	$2
fireworks-ai/accounts/fireworks/models/glm-4p5-air	131K						$0.22	$0.88
fireworks-ai/accounts/fireworks/models/gpt-oss-120b	131K						$0.15	$0.60
fireworks-ai/accounts/fireworks/models/gpt-oss-20b	131K						$0.05	$0.20
fireworks-ai/accounts/fireworks/models/kimi-k2-instruct	128K						$1	$3
fireworks-ai/accounts/fireworks/models/minimax-m2	128K						$0.30	$1
fireworks-ai/accounts/fireworks/models/qwen3-235b-a22b	128K						$0.22	$0.88
fireworks-ai/accounts/fireworks/models/qwen3-coder-480b-a35b-instruct	256K						$0.45	$2

Advanced Configuration

Custom Headers

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://api.fireworks.ai/inference/v1/",
    id: "fireworks-ai/accounts/fireworks/models/deepseek-r1-0528",
    apiKey: process.env.FIREWORKS_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
      ? "fireworks-ai/accounts/fireworks/models/qwen3-coder-480b-a35b-instruct"
      : "fireworks-ai/accounts/fireworks/models/deepseek-r1-0528";
  }
});