“ GPT-5 was launched on August 7, 2025, and is publicly accessible through ChatGPT, Microsoft Copilot, and via OpenAI's API.
Released in February 2025, GPT-4.5 was described by Altman as a "giant, expensive model".
In September 2024, OpenAI introduced o1-preview and a faster,
cheaper model named o1-mini. GPT-4o's ability to generate images was
released later, in March 2025, when it replaced DALL-E 3 in ChatGPT.
GPT-4o ("o" for "omni") is a multilingual, multimodal
generative pre-trained transformer developed by OpenAI
and released in May 2024.
ChatGPT was initially free to the public and remains free in a limited capacity.
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.
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). ChatGPT is frequently used for translation and summarization tasks, and can simulate
interactive environments such as a Linux terminal, a multi-user chat room, or simple text-based games
such as tic-tac-toe. The laborers were exposed to toxic
and traumatic content; one worker described the assignment as
"torture".
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