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Get started with the Workers AI REST API

This guide will instruct you through setting up and deploying your first Workers AI project. You will use the Workers AI REST API to experiment with a large language model (LLM).

​​ Prerequisites

Sign up for a Cloudflare account if you have not already.

​​ 1. Get API token and Account ID

You need your API token and Account ID to use the REST API.

To get these values:

  1. Log in to the Cloudflare dashboard and select your account.
  2. Go to AI > Workers AI.
  3. Select Use REST API.
  4. Get your API token:
    1. Select Create a Workers AI API Token.
    2. Review the prefilled information.
    3. Select Create API Token.
    4. Select Copy API Token.
    5. Save that value for future use.
  5. For Get Account ID, copy the value for Account ID. Save that value for future use.

​​ 2. Run a model via API

After creating your API token, authenticate and make requests to the API using your API token in the request.

You will use the Execute AI model endpoint to run the @cf/meta/llama-3-8b-instruct model:

$ curl{ACCOUNT_ID}/ai/run/@cf/meta/llama-3-8b-instruct \
-H 'Authorization: Bearer {API_TOKEN}' \
-d '{ "prompt": "Where did the phrase Hello World come from" }'

Replace the values for {ACCOUNT_ID} and {API_token}.

The API response will look like the following:

"result": {
"response": "Hello, World first appeared in 1974 at Bell Labs when Brian Kernighan included it in the C programming language example. It became widely used as a basic test program due to simplicity and clarity. It represents an inviting greeting from a program to the world."
"success": true,
"errors": [],
"messages": []

This example execution uses the @cf/meta/llama-3-8b-instruct model, but you can use any of the models in the Workers AI models catalog. If using another model, you will need to replace {model} with your desired model name.

By completing this guide, you have created a Cloudflare account (if you did not have one already) and an API token that grants Workers AI read permissions to your account. You executed the @cf/meta/llama-3-8b-instruct model using a cURL command from the terminal and received an answer to your prompt in a JSON response.

  • Models - Browse the Workers AI models catalog.