GPT — The Technology Behind ChatGPT

Raja Gupta
5 min readAug 7, 2023

ChatGPT has emerged as one of the most captivating AI applications in recent times. Most of us have used it and were stunned by the precise response we got from it.

But do you know that behind the scenes of ChatGPT lies the powerful technology known as “GPT”. It’s the real magic, the technology that empowers ChatGPT.

This article is for anyone who has ever interacted with ChatGPT and want to know what’s the magic behind it. How ChatGPT understands human queries so well and provide the perfect response.

We will dive into the magic of GPT and see how it brings ChatGPT to life!

What is GPT?

GPT stands for “Generative Pre-trained Transformer”. It’s a type of powerful artificial intelligence (AI) language model developed by OpenAI.

GPT models are designed to understand and generate human-like text. In simple words, think of GPT as a smart language robot that can understand human text and create its own responses, just like a human would!

GPT is the underlying technology of ChatGPT that enables the app to understand your messages and provide relevant responses.

The below image summarizes major points of GPT. We will look into them one by one

Let’s break down each term of GPT

Generative
In the context of GPT, “Generative” means that the GPT model has the ability to create new content.
The “Generative” aspect of GPT is what makes it truly remarkable. Unlike traditional computer programs that follow rigid rules, GPT has the creativity to generate original text. It can create sentences, paragraphs, or even stories that sound like they were written by a real person.

Pre-trained
Before becoming the talented conversationalist you experience in ChatGPT, GPT goes through a process called “Pre-training.”
During this phase, it is exposed to a vast amount of text from books, articles, websites, and more. This helps GPT learn the rules of grammar, the meaning of words, and the context in which they are used. It’s like feeding the model a library full of books to learn from!

Transformer
The “Transformer” is a specific architecture used in the GPT model. GPT’s magic is amplified by this “Transformer” architecture.
Imagine Transformers as a special tool that allows GPT to process words in sentences much better than older AI models. It helps GPT understand the connections between words, the context of a conversation, and even the emotions behind certain phrases.

The Transformer architecture revolutionized the world of language models and paved the way for more advanced AI interactions.

How GPT empowers ChatGPT?

ChatGPT is built upon GPT-3.5 and GPT-4. The free version of ChatGPT is based on GPT 3.5, while the more advanced GPT-4 based version, is provided to paid subscribers under the commercial name “ChatGPT Plus”.

GPT is like a super-smart friend that has read a lot of books, websites, and conversations. It learned from all that reading, so now it can understand and generate human-like text. ChatGPT uses this super-smart friend to have conversations with people, answer questions, tell stories, and help with writing. It’s like having a really clever buddy who knows a lot about words and can talk with you about all sorts of things!

When you type a message in ChatGPT, the magic begins. Your text is sent to GPT model, and it analyzes it using its pre-trained knowledge and Transformer powers. Then, the model generates a response based on what it learned during its training phase.

A brief history of GPT

The history of GPT versions and their relationship with ChatGPT is fascinating, showcasing the evolution of AI language models. Let’s take a journey through time:

GPT-1

The first GPT model, GPT-1, was introduced by OpenAI in 2018. It was the first iteration of the Generative Pre-trained Transformer.

It amazed the world with its ability to generate human-like text, but it had limitations in understanding context and coherence.

GPT-2

Released in 2019, GPT-2 took the world by storm with its impressive writing capabilities. GPT-2 was pre-trained on a dataset of over 7,000 unpublished fiction books from various genres and trained on a dataset of 8 million web pages.

It was so powerful that OpenAI initially hesitated to release the full model, fearing misuse. Eventually, they made it available, but in smaller versions.

GPT-3

In 2020, OpenAI introduced GPT-3, the most advanced and largest language model yet. GPT-3 is capable of generating text that is virtually indistinguishable from human-written content. Its creators trained it on an enormous corpus of text data, including books, articles, and web pages.

This was a significant leap forward as GPT-3 had a massive amount of pre-training data and showed remarkable language understanding and generation abilities.

GPT-3.5

GPT 3.5 is a sub class of GPT-3 Models created by OpenAI in 2022. Free version of ChatGPT is based on GPT-3.5.

GPT-4

GPT-4 is a multimodal large language model created by OpenAI and the fourth in its GPT series. It was released on March 14, 2023, and has been made publicly available in a limited form via ChatGPT Plus.

Unlike the predecessors, GPT-4 can take images as well as text as input. OpenAI has declined to reveal technical information such as the size of the GPT-4 model.

Other AI Apps that use GPT Models

GPT technology is not just limited to ChatGPT. Here are some other AI apps which also uses GPT.

OpenAI Playground
It’s an online platform provided by OpenAI that allows developers and users to experiment with GPT-3’s capabilities by interacting with the model through text prompts.

It is a web-based tool that makes it easy to test prompts and get familiar with how the API works. With the Playground, you can start using GPT-3, GPT-4, and more without writing a single line of code — you provide the prompt in plain English. Just about everything you could do by calling the API, you can also do in the Playground.

AI Dungeon
AI Dungeon is an interactive text-based adventure game that uses GPT to generate the game’s world and story based on the player’s input.

If you love AI and gaming, you may try this — https://aidungeon.io

Copy.ai

Copy.ai is a writing tool that uses GPT to generate various types of content, including blog headlines, emails, social media content, web copy, and more.

Built on top of GPT-3 model, Copy.ai Copy AI is designed to help users with the copywriting process. It provides various tools and writing frameworks to help get you started, is available in more than 25 languages.

Hope you enjoyed reading it. If yes, please clap and share it 🙂

If you have any queries, let me know in comment or get in touch with me at LinkedIn!

--

--

Raja Gupta

Author ◆ Blogger ◆ Solution Architect at SAP ◆ Demystifying Tech & Sharing Knowledge to Empower People