ChatGPT, developed by OpenAI and launched on November 30, 2022, is an AI chatbot that allows users to tailor conversations and has gained over 100 million users, making it the fastest-growing consumer software application. While it excels in various domains and functions, it also tends to generate incorrect information, a behavior referred to as 'hallucination'. The service operates on a freemium model, offering both free access to GPT-3.5 and paid subscriptions for the more advanced GPT-4 version.

2. ChatGPT
(Chat Generative Pre-Trained
Transformer)
ChatGPT is an artificial intelligence chatbot developed by OpenAI and
launched on November 30, 2022.
 It is notable for enabling users to refine and steer a conversation
towards a desired length, format, style, level of detail, and language
used. Successive prompts and replies are taken into account at each
stage of the conversation as a context.
 While its content spans various domains of knowledge.
ChatGPT has displayed a tendency to confidently provide inaccurate
information also.

3.  By January 2023, it had become the fastest-growing consumer
software application in history, gaining over 100 million users
and contributing to OpenAI's valuation growing to US$29 billion.
 Within months, Google, Baidu, and Meta accelerated
development of their competing products: PaLM-E, Ernie Bot,
and LLaMA.
 Some observers expressed concern over the potential of
ChatGPT to displace or atrophy human intelligence, and its
potential to enable plagiarism or fuel misinformation.

4.  According to the latest available data, ChatGPT
currently has over 100 million users.
 The website currently generates 1.8 billion
visitors per month.
 This user and traffic growth was achieved in a
record-breaking three-month period (from
February 2023 to April 2023).

5.  ChatGPT is built upon GPT-3.5 and GPT-4, from OpenAI's
proprietary series of foundational GPT models.
 These large language models (LLMs)have been fine-tuned for
conversational applications using a combination of supervised
and reinforcement learning techniques.
 ChatGPT was released as a freely available research preview,
but due to its popularity, OpenAI now operates the service on a
freemium model.
 It allows users on its free tier to access the GPT-3.5 based
version, while the more-advanced GPT-4 based version, as well
as priority access to newer features, are provided to paid
subscribers under the commercial name "ChatGPT Plus".

6. Features
 Although the core function of a chatbot is to mimic a
human conversationalist, ChatGPT is versatile.
 Among countless examples, it can write and debug
computer programs, compose music, teleplays, fairy
tales and student essays, answer test questions
(sometimes, depending on the test, at a level above
the average human test-taker), generate business
ideas, write poetry and song lyrics, translate and
summarize text, emulate a Linux system, simulate
entire chat rooms, play games like tic-tac-toe, or
simulate an ATM.

7. Limitations
 OpenAI acknowledges that ChatGPT "sometimes writes plausible-sounding but incorrect or
nonsensical answers".
 This behavior is common to large language models and is called "hallucination".
 The reward model of ChatGPT, designed around human oversight, can be over-optimized and thus
hinder performance, in an example of an optimization pathology known as Goodhart's law.
 ChatGPT has limited knowledge of events that occurred after September 2021.
 In training ChatGPT, human reviewers preferred longer answers, regardless of actual
comprehension or factual content.
 Training data also suffers from algorithmic bias, which may be revealed when ChatGPT responds to
prompts including descriptors of people.
 In one instance, ChatGPT generated a rap indicating that women and scientists of color were
inferior to white male scientists.