Sam Altman, OpenAI CEO, speaks during a media tour of the Stargate data center in Abilene, Texas, on Sept. 23, 2025. Stargate is a collaboration of OpenAI, Oracle and SoftBank, with promotional support from President Donald Trump, to build data centers and other infrastructure for artificial intelligence throughout the U.S.Kyle Grillot | Bloomberg | Getty ImagesOpenAI announced it will retire several models from its ChatGPT chatbot next month, including its GPT‑4o model that is beloved by some u...