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The OpenAI API: GPT, DALL-E & Whisper

Learn to use the OpenAI API for chat completions, image generation, text-to-speech, and speech-to-text so that you can utilize AI technologies in your applications. Plus you'll build your own AI application for creating healthy daily meal plans.

2 Days

Average time students take to complete this course.

Last updated: April 2024


Take your first step into the world of AI application development by diving deep into a fundamental technology: the OpenAI API. You'll learn everything there is about chat completions, image generation, text-to-speech, and speech-to-text. Plus you'll put your new knowledge into practice by building an AI application for healthy daily meal plans.

What you'll learn

  • The exciting world of AI application development
  • Make Chat Completions API calls using OpenAI’s GPT models
  • Integrate text-to-speech (TTS) and speech-to-text (Whisper) into your applications
  • Use text-to-image API calls to DALL-E to generate original images

Why is this Byte awesome?

Unlock the full potential of AI in your applications with our comprehensive (but still bite-sized!) course on the OpenAI API!

From mastering Chat Completions with OpenAI's cutting-edge GPT models, to generating captivating images with DALL-E, to turning text-into-speech and speech-into-text, this course has it all!

And there's more...

We believe you need to put your new knowledge into practice in order to really understand it enough to utilize it in the real world.

That's why you'll also build a real-world AI application using the OpenAI API: an AI-powered healthy daily meal planner.

Beginning with the ChatCompletions API you'll conjure up original recipes from the mind of a virtual chef and tailored to your dietary needs and preferences.

Then you'll witness your culinary creations come to life with original images generated by DALL-E for each meal.

And for the finishing touch, you'll have the text-to-speech API narrate the recipes, guiding you through each step as you cook.

Transform your ideas into reality with the power of AI, making every interaction more engaging and every application more intelligent (and every meal a masterpiece!).

Wait... What's a Byte?

Bytes are shorter courses that allow you to upgrade your skills and knowledge in a single day!

Learning is hard. And sometimes you just need a quick learning fix, right? To learn something awesome, interesting, and relevant to your career goals.

That's why we've created Bytes.

What Else Should I Know?

By becoming a ZTM member you'll not only get access to all our courses, bytes, and projects.

But you’ll also get to join our exclusive live online community classroom to learn alongside thousands of students, alumni, mentors, TAs and Instructors.

Most importantly, you'll be learning from an industry professional (Andrei) that has actual real-world experience as a Developer using AI tools. He teaches you the exact strategies and techniques he uses in his role.

Finally, as with all ZTM courses, this course is a living thing. It will be constantly updated as the landscape changes so you can use it as your go-to resource for the OpenAI API now and throughout your career.

Join 1,000s of Zero To Mastery graduates that have gotten hired and are now working at companies like Google, Tesla, Amazon, Apple, IBM, JP Morgan, Facebook, Shopify + other top tech companies.

They come from all different backgrounds, ages, and experiences. Many even started as complete beginners.

So there's no reason it can't be you too.

And you have nothing to lose. Because you can start learning right now and if this course isn't everything you expected, we'll refund you 100% within 30 days. No hassles and no questions asked.

When's the best time to get started? Today!

There's never a bad time to learn in-demand skills. But the sooner, the better. So start learning to use the OpenAI API today by joining the ZTM Academy. You'll have a clear roadmap to developing the skills to build your own projects, get hired, and advance your career.

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Course curriculum

Here's an overview of what you learn in this OpenAI API course.


3 lectures

Byte FAQ


Exercise: Meet Your Classmates and Instructor


Byte Resources



2 lectures



Setting Up Jupyter Notebook14:14


Deep Dive into Chat Completions API

12 lectures

Creating an OpenAI Account and an API Key3:51


Installing OpenAI API Authenticating to OpenAI8:41


OpenAI Models6:35


Making GPT Requests Using OpenAI API11:19


System Role4:17


OpenAI API Costs3:52




Chat Completion API Parameters: Temperature and Seed6:13


Chat Completion API Parameters: Top P, Max_Tokens, Penalties9:49


The Playground9:51


How OpenAI GPT Models Work5:15


LLMs Issues and Limitations6:21


Prompt Engineering Tactics for OpenAI APIs

10 lectures

Intro to Prompt Engineering2:40


Tactic 1: Position Instruction Clearly with Delimiters4:12


Tactic 2: Provide Detailed Instructions for the Context6:37


Tactic 3: Use the Rich Text Format (RTF)7:45


Tactic 4: Few Shot Prompting8:12


Tactic 5: Specify the Steps Required to Complete a Task5:16


Tactic 6: Give Models Time to Think2:12


Other Tactics and Principles for Better Prompting5:37


Avoid Hallucinations Using Guarding3:06




Deep Dive into Image Generation API (DALL-E 2 & 3)

3 lectures

Creating Variations of Images with DALL-E3:04


Generating Original Images Using the DALL-E10:33


Editing Images with DALL-E5:38


Deep Dive into Speech Recognition and Text-to-Speech (TTS) API

3 lectures

Translations with Whisper3:11


Transcriptions with Whisper5:47


Text-to-Speech (TTS) API7:02


Project: Building a Healthy Daily Meal Plan

6 lectures

Project Introduction2:31


Creating a Daily Meal Plan Using OpenAI API5:38


Creating the Prompt8:42


Running the Program3:23


Generating Original Images for the Recipes using DALL-E11:53


Narrate the Meals using the Text-to-Speech Model10:23


Where To Go From Here?

1 lectures

Review This Byte!


Meet your instructor

Your instructor (Andrei) isn't just an expert with years of real-world professional experience. He has been in your shoes. He makes learning fun. He makes complex topics feel simple. He will motivate you. He will push you. And he will go above and beyond to help you succeed.

Andrei Dumitrescu

Hi, I'm Andrei Dumitrescu!

Andrei is a Senior Network & Software Engineer with 15+ years of experience and over 50,000+ students have taken at least one of his top-rated courses.


Andrei Dumitrescu

DevOps Engineer

Frequently asked questions

Are there any prerequisites for this course?

  • Basic knowledge of Python is required. Don't have that yet? Take our Python course now!
  • An OpenAI account and API key are required, and you'll need a valid phone number to open an OpenAI account.

Do you provide a certificate of completion?

We definitely do and they are quite nice. You will also be able to add Zero To Mastery Academy to the education section of your LinkedIn profile as well.

Are there subtitles?

Yes! We have high quality subtitles in 11 different languages: English, Spanish, French, German, Dutch, Romanian, Arabic, Hindi, Portuguese, Indonesian, and Japanese.

You can even adjust the text size, color, background and more so that the subtitles are perfect just for you!

Still have more questions about the Academy?

Still have more questions specific to the Academy membership? No problem, we answer some more here.

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