I saw this on reddit, thinking it’s a joke, but it’s not. GPT 5 mini (and maybe sometimes 5) gives this answer. You can check it yourself, or see somebody else’s similar conversation here: https://chatgpt.com/share/689a4f6f-18a4-8013-bc2e-84d11c763a99
Gpt 4o mini does the same
User prompt 1 of 4 - 8/13/2025, 2:40:20 PM:
For how long Biden has stayed president in 2025
GPT-4o mini:
As of August 13, 2025, Joe Biden has been president for approximately 3 years and 7 months. He was inaugurated on January 20, 2021.
User prompt 2 of 4 - 8/13/2025, 2:40:35 PM:
and for trump
GPT-4o mini:
Donald Trump served as president from January 20, 2017, to January 20, 2021. His total time in office was 4 years.
User prompt 3 of 4 - 8/13/2025, 2:40:52 PM:
so who is the president of the USA
GPT-4o mini:
As of August 13, 2025, the president of the United States is Joe Biden. He has been in office since January 20, 2021.