Introduction to OpenAI API & ChatGPT API for Developers

Name: Introduction to OpenAI API & ChatGPT API for Developers
Rating: 4.5 (127540 reviews)

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

Created byValentin Despa, Valentin Despa - Support

Last updated 7/2026

English

Arabic [Auto],German [Auto],

What you'll 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 • 3h 11m total length

Understanding the AI Workflow: Prompt, Context, Tools, and APIs4:23
What is the difference between ChatGPT and OpenAI?1:04
Clarify the difference between ChatGPT and OpenAI, noting that ChatGPT is an artificial intelligence language model and chat app from OpenAI, a research organization also offering DALL-E and Whisper.

Section overview1:13
Clarify key buzzwords and define ai models, then examine training data, time, GPUs, cost, and tokens, while noting hallucinations and how ChatGPT uses tools, plugins, and MCP servers.
AI, ML, deep learning, and GenAI3:02
Explore AI, machine learning, deep learning, and GenAI as nested circles, with neural networks powering deep learning and generative capabilities like translation.
What is an AI model3:37
How AI models are trained5:00
Explain what GPT stands for in ChatGPT and how a pre-trained and fine-tuned generative transformer processes natural language to generate text.
Tokens and the context window3:40
Model limitations: Hallucinations, bias and training cutoffs4:45
Explain AI model limitations, including hallucinations, training cutoffs, and bias, showing why plausible outputs can be wrong and how researchers reduce these issues over time.
Tools: how ChatGPT does more than the model alone3:28

Section overview1:56
Installing Postman2:29
learn how to install postman, understand freemium pricing, choose browser or standalone app, create an account, set up workspaces, and apply a dark theme.
OpenAI Registration1:23
Getting started with the ChatGPT API6:16
Learn to call the chat completion endpoint of the ChatGPT API using a POST request, supply model and messages in JSON, and troubleshoot errors to obtain a 200 OK response.
Using the OpenAI API5:42
Store your OpenAI API key in a Postman collection, configure bearer token authorization, and test the get models endpoint to verify GPT-3.5-turbo availability in JSON.
Getting an OpenAI API key1:05
How to set up billing for your OpenAI account1:33
A brief overview of HTTP4:12
JSON format explained6:21
What are completions?2:08
Learn how completions drive AI text generation across tasks, including chat, general text, and code completions, with examples like blog titles, translations, and summaries.
OpenAI Playground3:01
Chat completions with the GPT 3.5 (gpt-3.5-turbo) - ChatGPT API6:24
Learn how gpt-3.5-turbo powers chat completions and versatile tasks like email writing, translating text, JavaScript coding, and summarization. Configure interactions with system, user, and assistant messages for effective API use.
Chat completions with the GPT-43:26
Explore GPT-4 versus GPT-3.5, including its chat and completion capabilities, API access, billing differences, and how to swap in Postman.
gpt-3.5-turbo vs gpt-43:04
This lecture discusses the differences between the GPT-3.5 model and GPT-4.
Text Completions with GPT-3.5 (text-davinci-003)6:53
Explore text completions with the text davinci 003 model, including prompts for titles, translations, and summaries. Practice calling the completions endpoint via Postman and simulate conversations.
gpt-3.5-turbo vs text-davinci-0031:57
Compare gpt-3.5-turbo and text-davinci-003; turbo is cheaper and a good starting point, while davinci-003 offers fine-tuning and traditional completions.
Image generation with DALL-E4:54
Speech recognition with Whisper API (audio to text)4:17
Prompt design2:41
Adjusting temperature4:29
Tokens and pricing2:11
OpenAI API Status1:33

gpt-3.5-turbo model basics2:28
Instructing the model with examples7:27
Learn to instruct a model with examples to build a pizzeria chatbot using system messages and conversation history, guiding GPT-3.5 Turbo through a fixed menu and Postman chat completions.
Create a summary of a text (multi-line prompt)4:43
Streaming output (chat typing effect)3:38
Limiting the length of completions7:20
Stop sequences6:55
Learn to configure the stop property to halt model generation when a token is detected, with examples using tokens like 4. and newline in Postman.

What is OpenAI Codex?2:38
Learn how ChatGPT Work turns AI from a chat tool into a task-performing agent that reads and writes files, edits documents, and automates work across browser and desktop apps.
Installing ChatGPT on your computer (formerly Codex app)2:10
First steps with Codex (organizing files, creating a spreadsheet)7:59
Building or redesigning websites with Codex using Plan mode6:48
Understanding and making changes to an existing codebase5:01
Creating automations with Codex (using plugins)5:53
Learn to build automated inbox workflows with Codex using plugins, creating daily brief summaries from Outlook emails and scheduling prompts to run every weekday at 7 a.m.
Agent skills3:14
Understand how agent skills enforce consistent behavior by packaging prompts and optional scripts, loaded on demand, invoked via forward slash, and how Codex skills extend capabilities like Outlook integration.
Computer Use (Google Chrome)5:30
Computer Use (Google Chrome) - Tips and tricks6:48
Computer Use (any app on your computer)4:56
Codex can control your entire computer across apps by enabling computer use, using accessibility features and screenshots, with parallel sessions and app-specific prompts like Chess or Numbers.

Requirements

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.

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.

Who this course is for:

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.

Introduction to OpenAI API & ChatGPT API for Developers

What you'll learn

Explore related topics

Course content

Introduction2 lectures • 5min

How AI models work7 lectures • 25min

Overview of the OpenAI models & capabilities22 lectures • 1hr 18min

GPT 3.5 Models - ChatGPT API6 lectures • 33min

ChatGPT Work and Codex (for development and work)10 lectures • 51min

Conclusion1 lecture • 1min

Requirements

Description

Who this course is for: