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ChatGPT Mini currently includes the models gpt-4o-mini, gpt-4.1-nano, and gpt-4.1-mini. ChatGPT Mini includes mini models that are low-cost and fast, optimized for everyday general tasks across all fields. In January 2023, the International Conference on Machine Learning banned any undocumented use of ChatGPT or other large language models to generate any text in submitted papers.

Bias in training data

As before, OpenAI has not disclosed technical details such as the exact number of parameters or the composition of its training dataset. GPT-5 was launched on August 7, 2025, and is publicly accessible through ChatGPT, Microsoft Copilot, and via OpenAI’s API. In September 2024, OpenAI introduced o1-preview and a faster, cheaper model named o1-mini. The image generation model GPT Image 1, which is based on GPT-4o, replaced DALL-E 3 in ChatGPT in March 2025. As of 2026update, if the user turns off data sharing for privacy, all previous transcripts and projects are permanently deleted without warning. Shortly after the bug was fixed, users could not see their conversation history.

The transformer mechanism anticipates text progression, whether it’s the next word, sentence, or paragraph, drawing from the learned patterns within its training data. Employing deep learning within the framework of transformer neural networks, ChatGPT and its counterparts simulate human-like text generation. GPT-4.1 supports an extended context window of up to 1,047,576 tokens and can generate outputs of up to 32,768 tokens — roughly equivalent to 24,000–26,000 words, depending on the language and formatting. GPT-5 is a powerful model for coding, reasoning, and agentic tasks across domains. It is meant to be used for smaller tasks, including vision tasks.

According to TechCrunch, it is a service based on o3 that combines advanced reasoning and web search capabilities to make reports more time to process than a typical chatbot interaction. At launch, OpenAI included more than 3 million GPTs created by GPT Builder users in the GPT Store. In November 2023, OpenAI released GPT Builder, a tool allowing users to customize ChatGPT’s behavior for a specific use case. In September 2025, OpenAI added a feature called Pulse, which generates a daily analysis of a user’s chats and connected apps such as Gmail and Google Calendar. 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. An optional “Memory” feature allows users to tell ChatGPT to memorize specific information.

How can you access ChatGPT?

• In July 2025, OpenAI released ChatGPT agent, an AI agent that can perform multi-step tasks.
• Many companies adopted ChatGPT and similar chatbot technologies into their product offers.
• In the reinforcement learning stage, human trainers first ranked responses generated by the model in previous conversations.
• Popular deep learning models are trained on mass amounts of media scraped from the Internet, often utilizing copyrighted material.
• Initially leveraging the GPT-3 large language model, which represents the third generation of Generative Pre-trained Transformer, ChatGPT utilizes a neural network machine learning architecture.

This makes it ideal for processing long documents, analyzing complex data, and maintaining continuity across extended conversations. GPT-5 is a reasoning model with 400,000 context window. ChatGPT operates via its Generative Pre-trained Transformer, employing specialized algorithms designed to identify patterns within sequences of data. ChatGPT was developed by OpenAI, an artificial intelligence research company that introduced the tool to the public in November 2022.

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. It can generate plausible-sounding but incorrect or nonsensical answers, known as hallucinations. The chatbot has also been criticized for its limitations and potential for unethical use. It has been lauded for its potential to transform numerous professional fields, and has instigated public debate about the nature of creativity and the aviator game online future of knowledge work. It is credited with accelerating the AI boom, an ongoing period marked by rapid investment and public attention toward the field of artificial intelligence (AI).

GPT-4o

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. In one instance, ChatGPT generated a rap in which women and scientists of color were asserted to be inferior to white male scientists. 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. ChatGPT can find more up-to-date information by searching the web, but this doesn’t ensure that responses are accurate, as it may access unreliable or misleading websites. OpenAI has sometimes mitigated this effect by updating the training data.

One of the most significant improvements was in the generation of text within images, which is especially useful for branded content. In March 2025, OpenAI updated ChatGPT to generate images using GPT Image instead of DALL-E. In October 2023, OpenAI’s image generation model DALL-E 3 was integrated into ChatGPT. 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. However, no machine translation services match human expert performance. Several studies have shown that ChatGPT can outperform Google Translate in some mainstream translation tasks.

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. The FTC asked OpenAI for comprehensive information about its technology and privacy safeguards, as well as any steps taken to prevent the recurrence of situations in which its chatbot generated false and derogatory content about people. ChatGPT has never been publicly available in China because OpenAI prevented Chinese users from accessing their site.

Additionally, users can access its privacy policy before registration. Italian regulators assert that ChatGPT was exposing minors to age-inappropriate content, and that OpenAI’s use of ChatGPT conversations as training data could violate Europe’s General Data Protection Regulation. A shadow market has emerged for Chinese users to get access to foreign software tools.