GPT-5 was launched on August 7, 2025, and is publicly accessible through ChatGPT, Microsoft Copilot, and via OpenAI’s API. In 2025, OpenAI added several features to make ChatGPT more agentic (capable of autonomously performing longer tasks). Users interact with ChatGPT through conversations which consist of text, audio, and image inputs and outputs. OpenAI collects data from ChatGPT users to further train and fine-tune its services. By January 2023, ChatGPT had become the fastest-growing consumer software application in history, gaining over 100 million users in two months. As of 2025, ChatGPT’s website is among the 5 most-visited websites globally, and has over 800 million active weekly users.
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• The fine-tuning process involved supervised learning and reinforcement learning from human feedback (RLHF).

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• ZDNET’s recommendations are based on many hours of testing, research, and comparison shopping.

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• The laborers were exposed to toxic and traumatic content; one worker described the assignment as « torture ».

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• The uses and potential of ChatGPT in health care has been the topic of scientific publications and experts have shared many opinions.
• ChatGPT is based on GPT foundation models that have been fine-tuned for conversational assistance.
• Despite this, users may « jailbreak » ChatGPT with prompt engineering techniques to bypass these restrictions.

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GPT-4.5

OpenAI supports limited, no-login access in many regions, so you can try ChatGPT instantly. The attorneys were sanctioned for filing the motion and presenting the fictitious legal decisions ChatGPT generated as authentic. The uses and potential of ChatGPT in health care has been the topic of scientific publications and experts have shared many opinions.

How to vibe code your first iPhone app with AI – no experience necessary

GPT-4, which was released on March 14, 2023, was made available via API and for premium ChatGPT users. Premium users were originally limited in the number of messages they could send to the new model, but OpenAI increased and eventually removed these limits. ChatGPT was initially free to the public, and OpenAI planned to monetize the service later.

Ratings and reviews

A 2023 study reported that GPT-4 obtained a better score than 99% of humans on the Torrance Tests of Creative Thinking. Stanford researchers reported that GPT-4 « passes a rigorous Turing test, diverging from average human behavior chiefly to be more cooperative. » Released in February 2025, GPT-4.5 was described by Altman as a « giant, expensive model ». In March 2023, a bug allowed some users to see the titles of other users’ conversations. OpenAI CEO Sam Altman said that users were unable to see the contents of the conversations.

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• In June 2023, hundreds of people attended a « ChatGPT-powered church service » at St. Paul’s Church in Fürth, Germany.

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• The Pro launch coincided with the release of the o1 model, providing unlimited access to o1 and advanced voice mode.

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• It can generate plausible-sounding but incorrect or nonsensical answers known as hallucinations.

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• In late March 2023, the Italian data protection authority banned ChatGPT in Italy and opened an investigation.
• Released in February 2025, GPT-4.5 was described by Altman as a « giant, expensive model ».
• A May 2023 statement by hundreds of AI scientists, AI industry leaders, and other public figures demanded that « [m]itigating the risk of extinction from AI should be a global priority ».

Artificial Intelligence

It can generate plausible-sounding but incorrect or nonsensical answers known as hallucinations. The chatbot can facilitate academic dishonesty, generate misinformation, and create malicious code. The ethics of its development, particularly the use of copyrighted content as training data, have also drawn controversy. Despite decades of using AI, Wall Street professionals report that consistently beating the market with AI, including recent large language models, is challenging due to limited and noisy financial data.

How to use ChatGPT: A beginner’s guide to the most popular AI chatbot

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• I’ve covered the models and modes above, but here’s a reminder of all the core features (as of October 2025).

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• Some, including Nature and JAMA Network, « require that authors disclose the use of text-generating tools and ban listing a large language model (LLM) such as ChatGPT as a co-author ».

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• […] It’s also a way to understand the « hallucinations », or nonsensical answers to factual questions, to which large language models such as ChatGPT are all too prone.

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• In the reinforcement learning stage, human trainers first ranked responses generated by the model in previous conversations.

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• In March 2023, a bug allowed some users to see the titles of other users’ conversations.
• OpenAI collects data from ChatGPT users to further train and fine-tune its services.

OpenAI’s outsourcing partner was Sama, a training-data company based in San Francisco, California. Apart from models, there are modes and tools in ChatGPT that allow you to go beyond basic chatting. Each one is built for a specific task, from in-depth research to real-time browsing. In my experience, the web version offers the fullest MonacoJack range of features available. The Guardian questioned whether any content found on the Internet after ChatGPT’s release « can be truly trusted » and called for government regulation.