The platform is designed for speed and precision, so users receive reliable responses in seconds. AI Chat delivers fast and clear answers by leveraging multiple advanced AI models. This feature makes it easy to handle multimedia content without manually transcribing or switching apps, saving time and making your study or work more productive. You can upload lectures, podcasts, meetings, or documents and ask the AI to summarize, extract insights, or answer questions. There are no strict limits on the number of conversations or questions you can ask. This all-in-one platform saves time and helps students, creators, and professionals handle tasks efficiently without juggling multiple tools.
To collect this data, we took conversations that AI trainers had with the chatbot. To create a reward model for reinforcement learning, we needed to collect comparison data, which consisted of two or more model responses ranked by quality. We gave the trainers access to model-written suggestions to help them compose their responses. We trained this model using Reinforcement Learning from Human Feedback (RLHF), using the same methods as InstructGPT⁠, but with slight differences in the data collection setup. ChatGPT is a sibling model to InstructGPT⁠, which is trained to follow an instruction in a prompt and provide a detailed response.
It was initially based on the reasoning model o3 and took 5 to 30 minutes per report. In February 2025, OpenAI released Deep Research, a feature that generates reports based on extensive web searches. When enabled in developer mode, this allows for improved third-party access to ChatGPT tools and servers. However, as of 2024, no machine translation services match human expert performance. In December 2023, the Albanian government decided to use ChatGPT for the rapid translation of European Union documents and the analysis of required changes needed for Albania's accession to the EU. ChatGPT (based on GPT-4) was better able to translate Japanese to English when compared to Bing, Bard, and DeepL Translator in 2023.
These rankings were used to create "reward models" that were used to fine-tune the model further by using several iterations of proximal policy optimization. Reinforcement learning consisted of human trainers ranking responses generated by the model in previous conversations. ChatGPT is based on GPT foundation models that have been fine-tuned for conversational assistance. In surveys, respondents favored the release of such a tool by a four-to-one margin, but nearly 30% of users declared that they would use ChatGPT less often if it watermarked outputs and while rival chatbots did not. An early workaround in 2023 involved prompting ChatGPT to assume the persona of DAN ("Do Anything Now"), a character that answers queries that would otherwise be rejected by the content policy. A 2025 analysis by The Washington Post estimated that ChatGPT started its responses with words like "yes" or "correct" almost 10 times more often than "no" or "wrong". ChatGPT and other chatbots have a tendency to flatter and agree with users even when they are wrong, sometimes to the point of validating delusions.
ChatGPT was initially free to the public and remains free in a limited capacity. It has an additional feature called "agentic mode" that allows it to take online actions for the user. In October 2025, OpenAI launched ChatGPT Atlas, a browser integrating the ChatGPT assistant directly into web navigation, to compete with existing browsers such as Google Chrome.
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Yes, AI Chat is excellent for creative writing and content creation. Having multiple models in one platform allows users to choose the right AI for study, writing, brainstorming, or daily problem-solving. Ask questions, get instant answers, brainstorm ideas, or interact with text, audio, and video—all free online and unlimited.
ChatGPT's adoption in education was rapid, but it was initially banned by several institutions. Another study, focused on the performance of GPT-3.5 and GPT-4 between March and June 2024, found that performance on objective tasks like identifying prime numbers and generating executable code was highly variable. It found that 52% of the responses contained inaccuracies and 77% were verbose. In one study, it produced solutions in C, C++, Python, and MATLAB for problems in computational physics. Robin Bauwens, an assistant professor at Tilburg University, found that a ChatGPT-generated peer review report on his article mentioned nonexistent studies.
ChatGPT has never been publicly available in mainland China, Hong Kong and Macau because OpenAI prevented users from these Chinese regions from accessing their site. 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. 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.