Fireworks AI

Access 15 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.

.env

FIREWORKS_API_KEY=your-api-key

src/mastra/agents/my-agent.ts

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

const agent = new Agent({
  id: "my-agent",
  name: "My Agent",
  instructions: "You are a helpful assistant",
  model: "fireworks-ai/accounts/fireworks/models/deepseek-v4-flash"
});

// 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

15 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
fireworks-ai/accounts/fireworks/models/deepseek-v4-flash	1.0M						$0.14	$0.28
fireworks-ai/accounts/fireworks/models/deepseek-v4-pro	1.0M						$2	$3
fireworks-ai/accounts/fireworks/models/glm-5p1	203K						$1	$4
fireworks-ai/accounts/fireworks/models/glm-5p2	1.0M						$1	$4
fireworks-ai/accounts/fireworks/models/gpt-oss-120b	131K						$0.15	$0.60
fireworks-ai/accounts/fireworks/models/gpt-oss-20b	131K						$0.07	$0.30
fireworks-ai/accounts/fireworks/models/kimi-k2p6	262K						$0.95	$4
fireworks-ai/accounts/fireworks/models/kimi-k2p7-code	262K						$0.95	$4
fireworks-ai/accounts/fireworks/models/minimax-m2p7	197K						$0.30	$1
fireworks-ai/accounts/fireworks/models/minimax-m3	512K						$0.30	$1
fireworks-ai/accounts/fireworks/models/qwen3p7-plus	262K						$0.40	$2
fireworks-ai/accounts/fireworks/routers/glm-5p1-fast	203K						$3	$9
fireworks-ai/accounts/fireworks/routers/kimi-k2p6-fast	262K						$2	$8
fireworks-ai/accounts/fireworks/routers/kimi-k2p6-turbo	262K						$2	$8
fireworks-ai/accounts/fireworks/routers/kimi-k2p7-code-fast	262K						$2	$8

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.fireworks.ai/inference/v1/",
    id: "fireworks-ai/accounts/fireworks/models/deepseek-v4-flash",
    apiKey: process.env.FIREWORKS_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});

Dynamic model selection

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "fireworks-ai/accounts/fireworks/routers/kimi-k2p7-code-fast"
      : "fireworks-ai/accounts/fireworks/models/deepseek-v4-flash";
  }
});