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ChatGPT is a generative artificial intelligence chatbot [2] [3] developed by OpenAI and launched in 2022. It is currently based on the GPT-4o large language model (LLM). ChatGPT can generate human-like conversational responses and enables users to refine and steer a conversation towards a desired length, format, style, level of detail, and language. [4]
Generative Pre-trained Transformer 4 (GPT-4) is a multimodal large language model trained and created by OpenAI and the fourth in its series of GPT foundation models. [1] It was launched on March 14, 2023, [1] and made publicly available via the paid chatbot product ChatGPT Plus, via OpenAI's API, and via the free chatbot Microsoft Copilot. [2]
Sam Altman noted on 15 May 2024 that GPT-4o's voice-to-voice capabilities were not yet integrated into ChatGPT, and that the old version was still being used. [9] This new mode, called Advanced Voice Mode, is currently in limited alpha release [10] and is based on the 4o-audio-preview. [11] On 1 October 2024, the Realtime API was introduced. [12]
GPT-4o is the new “flagship model” for the AI chatbot.
The free version uses medium. The variant using more compute is called o3-mini-high, and is available to paid subscribers. [4] [5] On February 2, 2025, OpenAI launched OpenAI Deep Research, a ChatGPT service using a version of o3 that makes comprehensive reports within 5 to 30 minutes, based on web searches. [6]
ChatGPT-4, OpenAI’s latest large language model (LLM) has certain advantages over ChatGPT-3.5 in terms of language understanding, context retention and generation of coherent responses.
The system then responds with an answer within seconds. ChatGPT reached 1 million users 5 days after its launch. [247] [248] As of 2023, ChatGPT Plus is a GPT-4 backed version of ChatGPT [249] available for a US$20 per month subscription fee [250] (the original version is backed by GPT-3.5). [251]
On December 5, 2024, the full version of o1 was released. [6] On the same day, a subscription called ChatGPT Pro was released, featuring access to a pro version of o1 that uses more compute to provide better answers. [6] In January 2025, o1 was integrated into Microsoft Copilot. [7] o1-preview's API is several times more expensive than GPT-4o. [8]