HowTo use OpenAI API for ChatGPT in Python

Posted on Mon 17 April 2023 in Development

OpenAI is a research organization that develops and promotes friendly AI for the betterment of humanity. One of its most popular projects is the development of the GPT (Generative Pre-trained Transformer) series, which includes ChatGPT, a large language model trained to generate human-like text based on given prompts. In this blog post, we'll show you how to use the OpenAI API for ChatGPT with Python examples.


Before we start, you'll need to create an OpenAI account and obtain an API key. You can do this by going to the OpenAI API website and signing up for an account. Once you have an account, you can obtain an API key from the API dashboard.

You'll also need the openai Python package, which you can install using pip:

pip install openai

Example: Generating Text with ChatGPT

Once you have your API key and have installed the openai package, you can start using the OpenAI API to generate text with ChatGPT. Here's an example:

import openai
import os

openai.api_key = os.environ["OPENAI_API_KEY"]

prompt = "What is the meaning of life?"

response = openai.Completion.create(

answer = response.choices[0].text.strip()

In this example, we import the openai package and set our API key using openai.api_key. We then define a prompt variable containing the text we want ChatGPT to generate more text from. We use openai.Completion.create() to send the prompt to the OpenAI API and receive a response containing generated text. Finally, we print the generated text using response.choices[0].text.strip().

In the openai.Completion.create() function, we specify the following parameters:

  • engine: The name of the GPT model to use. In this case, we're using the davinci model, which is the most capable and expensive model.
  • prompt: The text prompt to send to the GPT model.
  • max_tokens: The maximum number of tokens (words and punctuation) to generate in the response.

You can customize these parameters to suit your needs. For example, you can use a different GPT model, a different prompt, or a different max_tokens value.


Using the OpenAI API for ChatGPT is easy with the openai Python package. You can generate human-like text for a wide range of applications, such as chatbots, language translation, and content creation. With the power of the OpenAI API, you can take your AI projects to the next level.

Disclaimer and attribution

If you didn't get it until now... I need to tell you: all of the above has been generated by ChatGPT! This of course was just an experiment and I've no intention of regularly generating my blog posts with this tool. In case I did further experiments, I will always include this disclaimer at the bottom. I hope you enjoyed reading!