> For the complete documentation index, see [llms.txt](https://book.konstantinsecurity.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.konstantinsecurity.com/readme/machine-learning/chat-bots/chat-gpt.md). # Chat GPT **ChatGPT**, which stands for **Chat Generative Pre-trained Transformer**, is a [large language model](https://en.wikipedia.org/wiki/Large_language_model)-based [chatbot](https://en.wikipedia.org/wiki/Chatbot) developed by [OpenAI](https://en.wikipedia.org/wiki/OpenAI) and launched on November 30, 2022, which enables users to refine and steer a conversation towards a desired length, format, style, level of detail, and language. Successive prompts and replies, known as [prompt engineering](https://en.wikipedia.org/wiki/Prompt_engineering), are considered at each conversation stage as a context.[\[2\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-guardianpos-2) ChatGPT is built upon either [GPT-3.5](https://en.wikipedia.org/wiki/GPT-3.5) or [GPT-4](https://en.wikipedia.org/wiki/GPT-4)—members of OpenAI's proprietary series of [generative pre-trained transformer](https://en.wikipedia.org/wiki/Generative_pre-trained_transformer) (GPT) models, based on the [transformer](https://en.wikipedia.org/wiki/Transformer_\(machine_learning_model\)) architecture developed by [Google](https://en.wikipedia.org/wiki/Google)[\[3\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-3)—and is [fine-tuned](https://en.wikipedia.org/wiki/Fine-tuning_\(machine_learning\)) for conversational applications using a combination of [supervised](https://en.wikipedia.org/wiki/Supervised_learning) and [reinforcement learning](https://en.wikipedia.org/wiki/Reinforcement_learning) techniques.[\[4\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-NYT-20230718-4) ChatGPT was released as a freely available research preview, but due to its popularity, OpenAI now operates the service on a [freemium model](https://en.wikipedia.org/wiki/Freemium). It allows users on its free tier to access the GPT-3.5-based version. In contrast, the more advanced GPT-4 based version and priority access to newer features are provided to paid subscribers under the commercial name "[ChatGPT Plus](https://en.wikipedia.org/wiki/ChatGPT_Plus)". By January 2023, it had become what was then the fastest-growing consumer software application in history, gaining over 100 million users and contributing to OpenAI's [valuation](https://en.wikipedia.org/wiki/Business_valuation) growing to $29 billion.[\[5\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-5)[\[6\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-6) Within months, Google, [Baidu](https://en.wikipedia.org/wiki/Baidu), and [Meta](https://en.wikipedia.org/wiki/Meta_Platforms) accelerated the development of their competing products: [Bard](https://en.wikipedia.org/wiki/Bard_\(chatbot\)), [Ernie Bot](https://en.wikipedia.org/wiki/Ernie_Bot), and [LLaMA](https://en.wikipedia.org/wiki/LLaMA).[\[7\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-7) Microsoft launched its [Bing Chat](https://en.wikipedia.org/wiki/Bing_Chat) based on OpenAI's GPT-4. It raised concern among some observers over the potential of ChatGPT and similar programs to displace or atrophy [human intelligence](https://en.wikipedia.org/wiki/Human_intelligence), enable [plagiarism](https://en.wikipedia.org/wiki/Plagiarism), or fuel [misinformation](https://en.wikipedia.org/wiki/Misinformation).[\[4\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-NYT-20230718-4)[\[8\]](https://en.wikipedia.org/wiki/ChatGPT#cite_note-8) [Implementing GPT in NumPy](/readme/machine-learning/chat-bots/chat-gpt/implementing-gpt-in-numpy.md) --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://book.konstantinsecurity.com/readme/machine-learning/chat-bots/chat-gpt.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.