ChatGPT - Wikipedia ChatGPT is a generative artificial intelligence chatbot developed by OpenAI and released in November 2022 It currently uses GPT-5 1, a generative pre-trained transformer (GPT), to generate text, speech, and images in response to user prompts [3][4] It is credited with accelerating the AI boom, an ongoing period marked by rapid investment and public attention toward the field of artificial
GPT-4 - Wikipedia Generative Pre-trained Transformer 4 (GPT-4) is a large language model developed by OpenAI and the fourth in its series of GPT foundation models [2] GPT-4 is more capable than its predecessor GPT-3 5 and followed by its successor GPT-5 [3] GPT-4V is a version of GPT-4 that can process images in addition to text [4] OpenAI has not revealed technical details and statistics about GPT-4, such
GPT-4. 5 - Wikipedia GPT-4 5 (codenamed " Orion ") [2] is a large language model developed by OpenAI as part of the GPT series Officially released on February 27, 2025, GPT-4 5 is available to users subscribed to the ChatGPT Plus and Pro plans across web, mobile, and desktop platforms [3]
GPT-4o - Wikipedia GPT-4o ("o" for "omni") is a multilingual, multimodal generative pre-trained transformer developed by OpenAI and released in May 2024 [2] It can process and generate text, images and audio [3][4] Upon release, GPT-4o was free in ChatGPT, though paid subscribers had higher usage limits [5] GPT-4o was removed from ChatGPT in August 2025 when GPT-5 was released, but OpenAI reintroduced it for
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