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Introduction to OpenAI API & ChatGPT API for Developers (Udemy.com)

Intro to GenAI. Integrate APIs from OpenAI such as ChatGPT. Use Codex as a personal work assistant or coding agent

4.5
131,278 reviews

Created by: Valentin Despa

Last updated July 2026

Our take

Based on the ratings of 131,278 students, a sample of their written reviews and the syllabus, as the course stood in July 2026. No course pays to be reviewed.

Valentin Despa's course is a short introduction to the OpenAI API, about 3.2 hours across 48 lectures. It starts with how AI models work, then moves through the model lineup, the ChatGPT API, tokens and cost, image generation with DALL-E and speech transcription with Whisper. Most of the hands-on work happens in Postman and the OpenAI Playground rather than a code editor. A section on ChatGPT Work and Codex adds about 51 minutes. The audience list is wide, from developers to product managers.

Reviewers like the clear explanations and the live demos. One says it breaks things into simple language, so even someone outside tech can follow, and another calls it point to point for technical people. Roughly 119,000 of the 131,000 ratings are four or five stars. The complaints are consistent, though. A few say large parts are outdated, and that newer Postman and other app screens look different from the videos. One reviewer found it assumes Postman and starts with API keys too early.

At 3.2 hours it is a quick way to get the vocabulary straight: prompts, models, tokens, temperature. It is not a build-an-app course, since there are no quizzes or coding exercises. The last update was July 2026, so it is fresh on paper, but expect to hunt for menus that have moved. Treat it as a first orientation, then pick a code-based course when you want to ship something.

Best forDevelopers or curious non-coders who want a quick, hands-on tour of OpenAI API concepts before writing real code.
Skip it ifYou want to build a full app in code, or need screens that match today's OpenAI and Postman interfaces.

Pros

  • Short at 3.2 hours, so the core ideas land in an afternoon
  • Plain-language explanations that reviewers say even non-tech people can follow
  • Covers text, DALL-E images and Whisper transcription, plus tokens and cost
  • Live demos in Postman and the Playground show what real API calls look like

Cons

  • Reviewers say large parts are outdated because ChatGPT changes so fast
  • Newer Postman and other app screens differ from the videos, which confuses some
  • No quizzes or coding exercises, and it leans on Postman rather than code
very good introduction to ChatGPT API from a Developer's perspective
Muhib Ahmed, a student

Listed for all levels, but best for people with basic API or JavaScript familiarity who are new to OpenAI.

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What you will learn

  • Introduction to Gen AI
  • Understand the fundamentals of OpenAI and ChatGPT APIs
  • Register for an OpenAI account and get an API key
  • Understand key concepts: prompts, models, & tokens
  • Use the AI model behind ChatGPT
  • Use Postman to work with the OpenAI API
  • Navigate and utilize the OpenAI Playground effectively
  • Differentiate between GPT-3.5 models and their use cases
  • Generate images with DALL-E (Image API)
  • Transcribe speech using the Whisper API
  • Learn how to manage API costs effectively
  • Configure OpenAI models for creative output (temperature)

Course content

6 sections · 48 lectures · 3.2 hours of video 2 articles

  1. 1Introduction 1 free preview2 lectures · 5 min
  2. 2How AI models work7 lectures · 25 min
  3. 3Overview of the OpenAI models & capabilities 4 free previews22 lectures · 1.3 hours
  4. 4GPT 3.5 Models - ChatGPT API6 lectures · 33 min
  5. 5ChatGPT Work and Codex (for development and work)10 lectures · 51 min
  6. 6Conclusion1 lecture

Who it is for

The instructor says it suits

  • Developers or software engineers interested in integrating AI capabilities into their projects or applications.
  • Aspiring developers and data scientists who are interested in leveraging OpenAI's powerful APIs for their projects and applications.
  • Anyone with a basic understanding of programming and APIs but new to OpenAI and ChatGPT APIs.
  • Learners who want to explore the potential of natural language processing, code completion, image generation, and speech recognition in their work.
  • Professionals who seek to expand their knowledge of AI models, including GPT-3.5 and its use cases, to enhance their skill set.
  • Product managers, business analysts, and entrepreneurs exploring the potential of AI-powered solutions for their businesses or industries.

What you need before you start

  • An account with OpenAI (configuring billing and providing a credit card might be mandatory for older accounts)
  • Be in one of the countries supported by OpenAI
  • The possibility of installing new software (Postman app).
  • Prior experience working with APIs, especially RESTful APIs, will be helpful.
  • Familiarity with a programming language like JavaScript will be beneficial in following the course material and working with the OpenAI API.

How it compares

Against the other 205 rated Udemy courses in Artificial Intelligence on CourseDuck:

  • Rating4.5 out of 5higher than 58% of them
  • Reviews131,278#2 of 206 by number of reviews
  • Length3.2 hoursshorter than 61% of them
  • Last updatedJuly 2026more recently than 89% of them

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Course Description

Please note that this course is not affiliated with or endorsed by OpenAI. OpenAI is not responsible for the content or delivery of this course. Any references made to OpenAI are purely for informational purposes and do not imply endorsement or affiliation with OpenAI.


Unlock the power of artificial intelligence in your applications with this comprehensive course on the OpenAI API and ChatGPT API. With the rapid advancements in AI technology, it's more important than ever to stay ahead of the curve and harness these cutting-edge tools for your projects.

In this course, you'll dive deep into the world of AI-powered APIs, learning about the capabilities of OpenAI's suite of models, including GPT-3.5, GPT-4, DALL-E, and Whisper. Whether you're a seasoned developer or just starting out, our step-by-step guide will help you navigate the complexities of AI integration.

By enrolling in this course, you will:


  • Gain a solid understanding of API fundamentals and their role in modern applications.

  • Learn how to register for API access with OpenAI.

  • Explore the differences between ChatGPT and OpenAI.

  • Work with the AI models behind ChatGPT: GPT-3.5 and GPT-4

  • Familiarize yourself with tools like Postman and key concepts such as HTTP and JSON.

  • Get hands-on experience using OpenAI models for tasks like text completion, code generation, image generation, and speech recognition.

  • Master prompt design and learn how to control model behavior with techniques like adjusting temperature, setting stop sequences, and configuring for creativity.

  • Understand tokens and pricing to optimize usage and manage costs effectively.

With engaging examples and practical exercises, you'll develop the skills to implement AI-driven features in your projects, creating innovative and intelligent solutions that will set you apart from the competition.

Don't miss this opportunity to elevate your development skills and unlock the potential of AI. Enroll in this course today and take the first step toward a future powered by cutting-edge AI technology.


Legal Disclaimer

This course is an independent educational resource and is not endorsed by, affiliated with, or associated with OpenAI, L.L.C., or any of its products or services. OpenAI, ChatGPT, and related marks are trademarks of OpenAI, L.L.C. All product names, logos, and brands mentioned in this course are the property of their respective owners.

This course contains promotional materials.
Read More All Levels All Levels product length iconTime: 3.2h

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Instructor Details

Valentin Despa

I teach IT professionals what I wish I'd known earlier.

My foundation is built on years in the trenches as an Agile Enterprise Software Developer, engineering solutions for everything from fast-paced start-ups and SMBs to large global corporations. I hold recognized roles as an AWS Community Builder, Postman Supernova, and GitLab Hero, alongside a deep history of securing and building major open-source projects.

For over a decade, I've taken that real-world experience and quietly built one of the largest learning communities around API tooling, test automation, and DevOps practices. What started as a side YouTube channel turned into hundreds of thousands of learners, conference talks, and team workshops at companies most IT professionals have heard of.

The thread through all of it is the same: take something that looks intimidating and break it down so anyone can understand it in plain language.

Lately, I've been spending more time on practical AI in the workplace. I look at how teams can leverage AI for both everyday knowledge work and hands-on IT engineering, like coding and testing. I focus on cutting through the hype to figure out how AI actually helps IT professionals get work done, build, and ship faster. New formats, same approach.

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Reviews

4.5

131,278 ratings on Udemy

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By SHAKIRAT ODIN on 8/31/2026

This introduction to Open AI API & ChatGPT API is very informative. Its breaks it down into simplest language. Even for someone who is not in Tech will definitely understand.

By Tanvi Chavan on 7/29/2026

The training was good, informative, and well-structured. The concepts were explained clearly, and the session helped enhance my understanding of the topic

By Akhil Gopal on 6/29/2026

Amazing, above expectation! Really nice tutorial and the instructor sounds so helpful with his voice, adds a bit of personal touch which is expected from a tutor

By Thirumalai Selvan Subbiah on 6/23/2026

The course content & demonstration is good. Appreciated. At least some of the exercises should engage us to do in parallel in a playground kind of environment. Since we attend this training from office laptop, we have lot of restrictions to install / configure anything on our own. Hence a playground will help for us to explore the learnings.

By Hector Cantu Alvarado on 6/13/2026

New to AI. This course pace and styles is awesome. Is the first time I'm understanding all the world related to the models and their capabilities. The examples and the task are easy to follow and easy to learn. I want more.

By Gustavo Alcala Diaz on 5/27/2026

Excellent introduction. It provides a solid foundation for integrating AI into existing infrastructures. The examples are practical and easy to follow even for those of us coming from a database background

By Mandar Karekar on 5/23/2026

Great Course: The Course takes to you Straight to the Point of Practical Skills which is Really Good. I would like to Thanks the Instructor for making this course, And I would definitely explore his other courses.

By Uriel Guerra Alvarez on 5/11/2026

It's a good introduction, it could improve using newest models and information, for example links or where to find the same information he is looking at/for. So far so good, of course we need to continue investigating as this is only an introduction.

By Imran Ul Haq on 4/15/2026

Great Course! But is old as the new postman and other apps have totally different UI and that is too much confusing.

By Janmajaya Gantayat on 3/23/2026

The course is really a beginner friendly and someone who trying to understand the OpenAI open APIs to use in for some Handson practice. The way of presentation and content are really good and help me a lot in understanding the OpenAI open APIs cloning from scratch.

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Overall Score : 90 / 100

Introduction to OpenAI API & ChatGPT API for Developers
Visit course on Udemy Write a review
  • Video Duration: icon 3.2h
  • Price: $69.99
  • Provider: icon Udemy
  • Updated: icon July 2026
  • Level: All Levels All Levels
  • Language: icon English
  • Certificate: icon Yes
  • Lectures:48 in 6 sections
  • Students:235,900
  • Subtitles:21 languages
  • Udemy badge:Highest Rated
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