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Definition: ChatGPT


(1) For the ChatGPT browser, see ChatGPT Atlas.

(2) For public and private ChatGPT apps created by the user community, see GPT Store.

(3) (CHAT Generative Pretrained Transformer) An AI-powered chatbot from the OpenAI research company that simulates a human speaking English and more than 50 other languages. Also called an "AI assistant" and an example of "generative AI," ChatGPT creates a seemingly human response when asked open-ended questions about any topic. It is also used to write program code, compose music, answer test questions and generate short essays, articles and images. See OpenAI and generative AI.

Introduced in late 2022, within two months a hundred million were using ChatGPT, making it the fastest-growing Internet application ever. In comparison, TikTok took nine months to gain as much following.

Rising While Others Fall
In April 2025, Visual Capitalist charted ChatGPT's month-over-month traffic increase at 13%, while Wikipedia dropped 6%. Google, Facebook, WhatsApp, Instagram, Reddit, Yahoo!, YouTube and X all showed decreases ranging from 2% to 5%. The conclusion, at least for the moment is that people are relying on ChatGPT for answers instead of the traditional platforms. However, Google retaliated with its AI explanations on search results in 2024 (see Google AI Overview).

The World of Knowledge
Known as a "large language model" (LLM), ChatGPT gained its knowledge base from the text in hundreds of millions of websites, articles, journals and books, creating a gigantic hierarchy of word and phrase patterns. In the machine learning phase, results are adjusted by human engineers to make them more accurate. ChatGPT generates absolutely amazing results, and it is accused of delivering "coherent nonsense."

ChatGPT was derived from OpenAI's GPT-3 language model. The successor to InstructGPT, ChatGPT has been used by criminals to build hacking tools and malware. See GPT.

ChatGPT Plus - A Better Experience
For $20 a month, ChatGPT Plus gives subscribers priority during peak usage and access to the latest language models (GPT-4, GPT-5).

ChatGPT Pro - Developer Grade
At 10 times the fee of Plus, ChatGPT Pro is for engineers and researchers. Pro offers faster speeds, higher priority responses, a choice of several models, voice capabilities and access to new features.

Academia Is Alarmed
Because ChatGPT and other chatbots can create seemingly unique answers, university professors think that oral responses may be the only way to grade students. However, China has a three-day nationwide college exam in June, and all major tech firms turn off their chatbots to prevent cheating. Unfortunately, the U.S. has no single event. See SearchGPT, chatbot, Gemini chatbot, AI text generator, neural network and AI.

ChatGPT Does All This
In 2023, The New York Times listed the following ways people use ChatGPT.




Create a Happy Computer
The following is the first of five paragraphs from ChatGPT when prompted with "create an essay about a happy computer."



A Few Months Later
When the same question was asked several months later, ChatGPT waxed poetic:



Getting Better All the Time
With additional training and tuning, the language model, the foundation of these chatbots, is improving all the time (see large language model).




A Lot of Controversy
North Korea, China, Russia, Italy and other countries banned ChatGPT right away, but Italy has since lifted its ban. Will the panic be soon forgotten or is it here to stay? See GPT and Luddite. (Image courtesy of ZDNET.)





To explore the variety of topics in this reference, see What's in this encyclopedia.