Later reports showed the bug was much more severe than initially believed, with OpenAI reporting that it had leaked users' "first and last name, email address, payment address, the last four digits (only) of a credit card number, and credit card expiration date". Shortly after the bug was fixed, users could not see their conversation history. In March 2023, a bug allowed some users to see the titles of other users' conversations. Despite this, users may "jailbreak" ChatGPT with prompt engineering techniques to bypass these restrictions.
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- Geoffrey Hinton, one of the “fathers of AI”, voiced concerns that future AI systems may surpass human intelligence.
- In March 2023, a bug allowed some users to see the titles of other users’ conversations.
- As of 2025, ChatGPT’s website is among the top 5 most-visited websites globally, and has over 800 million active weekly users.
- The ethics of its development, particularly the use of copyrighted content as training data, have also drawn controversy.
- ChatGPT is a chatbot and AI assistant built on large language model (LLM) technology.
- GPT-5 was launched on August 7, 2025, and is publicly accessible through ChatGPT, Microsoft Copilot, and via OpenAI’s API.
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- OpenAI said it has taken steps to effectively clarify and address the issues raised; an age verification tool was implemented to ensure users are at least 13 years old.
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- ChatGPT gained one million users in five days and 100 million in two months, becoming the fastest-growing internet application in history.
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- As before, OpenAI has not disclosed technical details such as the exact number of parameters or the composition of its training dataset.
OpenAI said it has taken steps to effectively clarify and address the issues raised; an age verification tool was implemented to ensure users are at least 13 years old. In late March 2023, the Italian data protection authority banned ChatGPT in Italy and opened an investigation. A shadow market has emerged for users to get access to foreign software tools. Stanford researchers reported that GPT-4 "passes a rigorous Turing test, diverging from average human behavior chiefly to be more cooperative." In December 2023, ChatGPT became the first non-human to be included in Nature's 10, an annual listicle curated by Nature of people considered to have made significant impact in science. A 2023 study reported that GPT-4 obtained a better score than 99% of humans on the Torrance Tests of Creative Thinking.
GPT-4, which was released on March 14, 2023, was made available via API and for premium ChatGPT users. The Pro launch coincided with the release of the o1 model, providing unlimited access to o1 and advanced voice mode. According to the company, the paid version of the website was still experimental, but provided access during peak periods, no downtime, priority access to new features, and faster response speeds. ChatGPT was initially free to the public, and OpenAI planned to monetize the service later. In December 2024, OpenAI launched a new feature allowing users to call ChatGPT frostybet casino login with a telephone for up to 15 minutes per month for free. To prevent offensive outputs from being presented to and produced by ChatGPT, queries are filtered through the OpenAI "Moderation endpoint" API (a separate GPT-based AI).
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ChatGPT also provided an outline of how human reviewers are trained to reduce inappropriate content and to attempt to provide political information without affiliating with any political position. Kevin Roose of The New York Times called it "the best artificial intelligence chatbot ever released to the general public". 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. In August 2024, OpenAI announced it had created a text watermarking method but did not release it for public use, saying that users would go to a competitor without watermarking if it publicly released its watermarking tool. OpenAI CEO Sam Altman said that users were unable to see the contents of the conversations. One such workaround, popularized on Reddit in early 2023, involved making ChatGPT assume the persona of "DAN" (an acronym for "Do Anything Now"), instructing the chatbot that DAN answers queries that would otherwise be rejected by the content policy.
A 2025 Sentio University survey of 499 LLM users with self-reported mental health conditions found that 96.2% use ChatGPT, with 48.7% using it specifically for mental health support or therapy-related purposes. At launch, the feature was limited to purchases on Etsy from US users with a payment method linked to their OpenAI account. According to TechCrunch, it is a service based on o3 that combines advanced reasoning and web search capabilities to make comprehensive reports within 5 to 30 minutes. At launch, OpenAI included more than 3 million GPTs created by GPT Builder users in the GPT Store. ChatGPT's Mandarin Chinese abilities were lauded, but the ability of the AI to produce content in Mandarin Chinese in a Taiwanese accent was found to be "less than ideal" due to differences between mainland Mandarin Chinese and Taiwanese Mandarin. None of the tested services were a perfect replacement for a fluent human translator.
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As of July 2025, Science expects authors to release in full how AI-generated content is used and made in their work. Andrew Ng argued that "it's a mistake to fall for the doomsday hype on AI—and that regulators who do will only benefit vested interests." Yann LeCun dismissed doomsday warnings of AI-powered misinformation and existential threats to the human race. Juergen Schmidhuber said that in 95% of cases, AI research is about making "human lives longer and healthier and easier." He added that while AI can be used by bad actors, it "can also be used against the bad actors". A May 2023 statement by hundreds of AI scientists, AI industry leaders, and other public figures demanded that "mitigating the risk of extinction from AI should be a global priority". Geoffrey Hinton, one of the "fathers of AI", voiced concerns that future AI systems may surpass human intelligence. In October 2025, OpenAI banned accounts suspected to be linked to the Chinese government for violating the company's national security policy.
ChatGPT's training data includes software manual pages, information about internet phenomena such as bulletin board systems, multiple programming languages, and the text of Wikipedia. The laborers were exposed to toxic and traumatic content; one worker described the assignment as "torture". To build a safety system against harmful content (e.g., sexual abuse, violence, racism, sexism), OpenAI used outsourced Kenyan workers earning around $1.32 to $2 per hour to label such content. The fine-tuning process involved supervised learning and reinforcement learning from human feedback (RLHF). The chatbot can facilitate academic dishonesty, generate misinformation, and create malicious code. Despite its acclaim, the chatbot has been criticized for its limitations and potential for unethical use.
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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. 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. In October 2025, OpenAI reported that approximately 0.15% of ChatGPT's active users in a given week have conversations including explicit indicators of potential suicidal planning or intent, translating to more than a million people weekly. It was capable of autonomously performing tasks through web browser interactions, including filling forms, placing online orders, scheduling appointments, and other browser-based tasks.