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Want to experience the power of large language models but struggling with insufficient local computer performance? Typically, we would deploy models locally using tools like ollama, but due to computer resource limitations, we can often only run smaller models like 1.5B, 7B, or 14B. Deploying a 70 billion parameter model is a huge challenge for local hardware.

Now, you can leverage Cloudflare's Workers AI to deploy large language models like 70B online and access them via the internet. Its interface is compatible with OpenAI, meaning you can use it like you would use the OpenAI API. The only downside is the limited daily free quota, with charges incurred for exceeding it. If you're interested, give it a try!

Prerequisites: Log in to Cloudflare and Bind a Domain ​

If you don't have your own domain yet, Cloudflare provides a free account domain. However, please note that this free domain may not be directly accessible in some regions.

First, open the Cloudflare website (https://dash.cloudflare.com) and log in to your account.

Step 1: Create a Workers AI Instance ​

  1. Find Workers AI: In the Cloudflare control panel, in the left navigation bar, find "AI" -> "Workers AI", then click "Create from Worker template".

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  2. Create Worker: Next, click "Create Worker".

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  3. Enter Worker Name: Enter a string of English letters, which will serve as the default account domain for your Worker.

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  1. Deploy: Click the "Deploy" button in the lower right corner to complete the creation of the Worker.

Step 2: Modify Code and Deploy the Llama 3.3 70B Large Language Model ​

  1. Enter Code Editing: After deployment, you will see the interface shown below. Click "Edit code".

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  2. Clear Code: Delete all the preset code in the editor.

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  3. Paste Code: Copy and paste the following code into the code editor:

    Here we are using the llama-3.3-70b-instruct-fp8-fast model, which has 70 billion parameters.

    You can also find other models to replace in the Cloudflare Models page, such as the Deepseek open-source model. But currently, llama-3.3-70b-instruct-fp8-fast is one of the largest and most effective models available.

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```javascript
const API_KEY='123456';
export default {
  async fetch(request, env) {

    let url = new URL(request.url);
    const path = url.pathname;

    const authHeader = request.headers.get("authorization") || request.headers.get("x-api-key");
    const apiKey = authHeader?.startsWith("Bearer ")  ? authHeader.slice(7)  : null;
                        
    if (API_KEY && apiKey !== API_KEY) {

      return new Response(JSON.stringify({
        error: {
            message: "Invalid API key. Use 'Authorization: Bearer your-api-key' header",
            type: "invalid_request_error",
            param: null,
            code: "invalid_api_key"
        }
      }), {
          status: 401,
          headers: {
              "Content-Type": "application/json",
          }
      });
    }

    if (path === "/v1/chat/completions") {
      const requestBody = await request.json();
       // messages - chat style input
	  const {message}=requestBody
	  let chat = {
		messages: message
	  };
      let response = await env.AI.run('@cf/meta/llama-3.3-70b-instruct-fp8-fast', requestBody);
    
      let resdata={
        choices:[{"message":{"content":response.response}}]
      }    
      return Response.json(resdata);
    }  
   
  }
};
```
  1. Deploy Code: After pasting the code, click the "Deploy" button.

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Step 3: Bind a Custom Domain ​

  1. Return to Settings: Click the return button on the left to return to the Worker management page, find "Settings" -> "Domains & Routes".

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  1. Add Custom Domain: Click "Add a domain", then select "Custom domain" and enter the subdomain that you have already bound to Cloudflare.

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Step 4: Use in OpenAI-Compatible Tools ​

After adding a custom domain, you can use this large language model in any tool that is compatible with the OpenAI API.

  • API Key: is the API_KEY you set in the code, which defaults to 123456.
  • API Address: https://your-custom-domain/v1

Thanks to Cloudflare's powerful GPU resources, it is very smooth to use.

Precautions ​

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