OpenAI GPT-3 API error: "Invalid URL (POST /v1/chat/completions)"

Question

Here is my code snippet:

const { Configuration, OpenAI, OpenAIApi } = require ("openai");
const configuration = new Configuration({
    apiKey: 'MY KEY'
})

const openai = new OpenAIApi(configuration)

async function start() {
    const response = await openai.createChatCompletion({
        model:"text-davinci-003",
        prompt: "Write a 90 word essay about Family Guy",
        temperature: 0,
        max_tokens: 1000
    })

    console.log(response.data.choices[0].text)
}

start()

when I run: node index

I run into this issue:

data: {
      error: {
        message: 'Invalid URL (POST /v1/chat/completions)',
        type: 'invalid_request_error',
        param: null,
        code: null
      }
    }
  },
  isAxiosError: true,
  toJSON: [Function: toJSON]
}

Node.js v18.15.0

I've looked all over the internet and tried some solutions but nothing seems to work. Please help!

Usually others have some link attached to their code when I look up this problem online. Very much a beginner at this stuff so any help would be much appreciated

Answer 1

TL;DR: Treat the text-davinci-003 as a GPT-3 model. See the code under OPTION 1.

Introduction

At first glance, as someone who's been using the OpenAI API for the past few months, I thought the answer was straight and simple if you read the official OpenAI documentation. Well, I read the documentation once again, and now I understand why you're confused.

Confusion number 1

You want to use the text-davinci-003 model. This model is originally from the GPT-3 model family. But if you take a look at the OpenAI models overview and click GPT-3, you won't find text-davinci-003 listed as a GPT-3 model. This is unexpected.

Confusion number 2

Moreover, the text-davinci-003 is listed as a GPT-3.5 model.

Confusion number 3

As if this isn't confusing enough, if you take a look at the OpenAI model endpoint compatibility, you'll find the text-davinci-003 listed under the /v1/completions endpoint. This API endpoint is used for the GPT-3 model family.

Wait, what?

The text-davinci-003 isn't listed as a GPT-3 model. It's listed as a GPT-3.5 model but is compatible with the GPT-3 API endpoint. This doesn't make any sense.

Test

Either the text-davinci-003 could be treated as a GPT-3 model or a GPT-3.5 model, or perhaps both? Let's make a test.

Note: OpenAI NodeJS SDK v4 was released on August 16, 2023, and is a complete rewrite of the SDK. The code below differs depending on the version you currently have. See the v3 to v4 migration guide.

OPTION 1: Treat the text-davinci-003 as a GPT-3 model --> IT WORKS ✓

If you treat the text-davinci-003 as a GPT-3 model, then run test-1.js, and the OpenAI will return the following completion:

This is indeed a test

• If you have the OpenAI NodeJS SDK v3:

test-1.js

const { Configuration, OpenAIApi } = require('openai');

const configuration = new Configuration({
  apiKey: process.env.OPENAI_API_KEY,
});

const openai = new OpenAIApi(configuration);

async function getCompletionFromOpenAI() {
  const completion = await openai.createCompletion({
    model: 'text-davinci-003',
    prompt: 'Say this is a test',
    max_tokens: 7,
    temperature: 0,
  });

  console.log(completion.data.choices[0].text);
}

getCompletionFromOpenAI();

• If you have the OpenAI NodeJS SDK v4:

test-1.js

import OpenAI from 'openai';

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
});

async function getCompletionFromOpenAI() {
  const completion = await openai.completions.create({
    model: 'text-davinci-003',
    prompt: 'Say this is a test',
    max_tokens: 7,
    temperature: 0,
  });

  console.log(completion.choices[0].text);
}

getCompletionFromOpenAI();

OPTION 2: Treat the text-davinci-003 as a GPT-3.5 model --> IT DOESN'T WORK ✗

If you treat the text-davinci-003 as a GPT-3.5 model, then run test-2.js, and the OpenAI will return the following error:

data: {
  error: {
    message: 'Invalid URL (POST /v1/chat/completions)',
    type: 'invalid_request_error',
    param: null,
    code: null
  }
}

• If you have the OpenAI NodeJS SDK v3:

test-2.js

const { Configuration, OpenAIApi } = require('openai');

const configuration = new Configuration({
  apiKey: process.env.OPENAI_API_KEY,
});

const openai = new OpenAIApi(configuration);

async function getChatCompletionFromOpenAI() {
  const chatCompletion = await openai.createChatCompletion({
    model: 'text-davinci-003',
    messages: [{ role: 'user', content: 'Hello!' }],
    temperature: 0,
  });

  console.log(chatCompletion.data.choices[0].message.content);
}

getChatCompletionFromOpenAI();

• If you have the OpenAI NodeJS SDK v4:

test-2.js

import OpenAI from 'openai';

const openai = new OpenAI({
  apiKey: process.env.OPENAI_API_KEY,
});

async function getChatCompletionFromOpenAI() {
  const chatCompletion = await openai.chat.completions.create({
    model: 'gpt-3.5-turbo',
    messages: [{role: 'user', content: 'Hello!'}],
    temperature: 0,
  });

  console.log(chatCompletion.choices[0].message.content);
}

getChatCompletionFromOpenAI();

Conclusion

Treat the text-davinci-003 as a GPT-3 model. See the code under OPTION 1.

Answer 2

You are mixing two capabilities of OpenAI API.

You can either create one-time completion from a prompt, what they call Completions, or you can create completion from a discussion between an agent an a user, what they call ChatCompletion.

Depending on which one you want to use the parameters are not the same.

In the first case it should be

const response = await openai. createCompletion({
        model:"text-davinci-003",
        prompt: "Write a 90 word essay about Family Guy",
        temperature: 0,
        max_tokens: 1000
    })

and in the other case, you need to specify messages, and the role.

const completion = await openai.createChatCompletion({
  model: "gpt-3.5-turbo",
  messages: [{role: "user", content: "Hello world"}],
});

Take a look at the API documentation to understand the difference between the two different APIs.