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);
}

Models

Model	Image	Audio	Video	Tools	Streaming	Context Window
fireworks-ai/accounts/fireworks/models/deepseek-r1-0528	✗	✗	✗	✓	✗	160,000
fireworks-ai/accounts/fireworks/models/deepseek-v3p1	✗	✗	✗	✓	✗	163,840
fireworks-ai/accounts/fireworks/models/deepseek-v3-0324	✗	✗	✗	✓	✗	160,000
fireworks-ai/accounts/fireworks/models/kimi-k2-instruct	✗	✗	✗	✓	✗	128,000
fireworks-ai/accounts/fireworks/models/qwen3-235b-a22b	✗	✗	✗	✓	✗	128,000
fireworks-ai/accounts/fireworks/models/gpt-oss-20b	✗	✗	✗	✓	✗	131,072
fireworks-ai/accounts/fireworks/models/gpt-oss-120b	✗	✗	✗	✓	✗	131,072
fireworks-ai/accounts/fireworks/models/glm-4p5-air	✗	✗	✗	✓	✗	131,072
fireworks-ai/accounts/fireworks/models/qwen3-coder-480b-a35b-instruct	✗	✗	✗	✓	✗	256,000
fireworks-ai/accounts/fireworks/models/glm-4p5	✗	✗	✗	✓	✗	131,072

Advanced Configuration

Custom Headers

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://api.fireworks.ai/inference/v1/chat/completions",
    modelId: "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/deepseek-r1-0528"
      : "fireworks-ai/accounts/fireworks/models/deepseek-v3-0324";
  },
});