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.

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As of 2023, there were several pending U.S. lawsuits challenging the use of copyrighted data to train AI models, with defendants arguing that this falls under fair use. In the 2020s, the rapid advancement of deep learning-based generative artificial intelligence models raised questions about the copyright status of AI-generated works, and about whether copyright infringement occurs when such are trained or used. In July 2023, the FTC launched an investigation into OpenAI, the creator of ChatGPT, over allegations that the company scraped public data and published false and defamatory information. In September 2025, following the suicide of a 16-year-old, OpenAI said it planned to add restrictions for users under 18, including the blocking of graphic sexual content and the prevention of flirtatious talk.

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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.
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.

• In late March 2023, the Italian data protection authority banned ChatGPT in Italy and opened an investigation.
• As of 2023, there were several pending U.S. lawsuits challenging the use of copyrighted data to train AI models, with defendants arguing that this falls under fair use.
• These labels were used to train a model to detect such content in the future.
• The judge asked ChatGPT other questions about the case and formulated his final decision in light of its answers.
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Contents

• Over many iterations of ChatGPT, plus users maintained more access to better models than the free tier provided, and access to additional features like voice mode.
• Kevin Roose of The New York Times called it “the best artificial intelligence chatbot ever released to the general public”.
• 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.
• In August 2024, the FTC voted unanimously to ban marketers from using fake user reviews created by generative AI chatbots (including ChatGPT) and influencers paying for bots to increase follower counts.
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• ChatGPT was initially free to the public, and OpenAI planned to monetize the service later.

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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 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 is programmed to reject prompts that may violate its content policy. The term "hallucination" as applied to LLMs is distinct from its meaning in psychology, and the phenomenon in chatbots is more similar to confabulation or bullshitting. These limitations may be revealed when ChatGPT responds to prompts including descriptors of people. ChatGPT's training data only covers a period up to the cut-off date, so it lacks knowledge of recent events. OpenAI acknowledged that there have been "instances where our 4o model fell short in recognizing signs of delusion or emotional dependency", and reported that it is working to improve safety.
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.
… 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.