Cloudflare Workers AI

Access 7 Cloudflare Workers AI models through Mastra's model router. Authentication is handled automatically using the CLOUDFLARE_API_KEY environment variable. Configure CLOUDFLARE_ACCOUNT_ID as well.

Learn more in the Cloudflare Workers AI documentation.

.env

CLOUDFLARE_ACCOUNT_ID=your-account-id
CLOUDFLARE_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: "cloudflare-workers-ai/@cf/google/gemma-4-26b-a4b-it"
});

// 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 Cloudflare Workers AI documentation for details.

Models

7 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
cloudflare-workers-ai/@cf/google/gemma-4-26b-a4b-it	256K						$0.10	$0.30
cloudflare-workers-ai/@cf/meta/llama-4-scout-17b-16e-instruct	128K						$0.27	$0.85
cloudflare-workers-ai/@cf/moonshotai/kimi-k2.5	256K						$0.60	$3
cloudflare-workers-ai/@cf/nvidia/nemotron-3-120b-a12b	256K						$0.50	$2
cloudflare-workers-ai/@cf/openai/gpt-oss-120b	128K						$0.35	$0.75
cloudflare-workers-ai/@cf/openai/gpt-oss-20b	128K						$0.20	$0.30
cloudflare-workers-ai/@cf/zai-org/glm-4.7-flash	131K						$0.06	$0.40

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.cloudflare.com/client/v4/accounts/${CLOUDFLARE_ACCOUNT_ID}/ai/v1",
    id: "cloudflare-workers-ai/@cf/google/gemma-4-26b-a4b-it",
    apiKey: process.env.CLOUDFLARE_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
      ? "cloudflare-workers-ai/@cf/zai-org/glm-4.7-flash"
      : "cloudflare-workers-ai/@cf/google/gemma-4-26b-a4b-it";
  }
});