The Pro launch coincided with the release of the o1 model, providing unlimited access to o1 and advanced voice mode. It is designed to generate human-like text and can carry out a wide variety of tasks. I’ve covered the models and modes above, but here’s a reminder of all the core features (as of October 2025).
{

• OpenAI collects data from ChatGPT users to further train and fine-tune its services.

{

• 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”.

|}{

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

{

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

|}

|}

Is ChatGPT accurate?

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”. As of July 2025, Science expects authors to release in full how AI-generated content is used and made in their work. Many individuals use ChatGPT and comparable large language models (LLM) for mental health and emotional support. 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. 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. Despite its acclaim, the chatbot has been criticized for its limitations and potential for unethical use.

{
• The Guardian questioned whether any content found on the Internet after ChatGPT’s release “can be truly trusted” and called for government regulation.

|}{

• As of 2025, ChatGPT’s website is among the 5 most-visited websites globally, and has over 800 million active weekly users.

|}

• Their leaders emphasized their earlier caution regarding public deployment was due to the trust the public places in Google Search.
• The ethics of its development, particularly the use of copyrighted content as training data, have also drawn controversy.
• A 2023 study reported that GPT-4 obtained a better score than 99% of humans on the Torrance Tests of Creative Thinking.

{

• 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.

|}

GPT Store

There’s even a Projects feature that keeps all your chats organized, plus a Library to manage all MonacoJack your generated images. ZDNET’s recommendations are based on many hours of testing, research, and comparison shopping. And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing.

{
• 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.

|}

• By January 2023, ChatGPT had become the fastest-growing consumer software application in history, gaining over 100 million users in two months.
• Stanford researchers reported that GPT-4 “passes a rigorous Turing test, diverging from average human behavior chiefly to be more cooperative.”

{

• […] 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.

|}

• 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.

{

• 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.

|}

Mental Health

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. […] 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. ChatGPT’s training data only covers a period up to the cut-off date, so it lacks knowledge of recent events. The integration used ChatGPT to write prompts for DALL-E guided by conversations with users. In March 2025, OpenAI updated ChatGPT to generate images using GPT-4o instead of DALL-E. The laborers were exposed to toxic and traumatic content; one worker described the assignment as “torture”.

GPT-4o

This includes text-to-image models such as Stable Diffusion and large language models such as ChatGPT. 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 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. These limitations may be revealed when ChatGPT responds to prompts including descriptors of people. In one instance, ChatGPT generated a rap in which women and scientists of color were asserted to be inferior to white male scientists. Despite this, users may “jailbreak” ChatGPT with prompt engineering techniques to bypass these restrictions.