Users have been complaining the GPT-4o has become so enthusiastic that it's verging on sycophantic. The change appears to be the unintentional result of a series of updates, which OpenAI is now attempting to resolve "asap.

OpenAI has rolled back the ChatGPT 4o update that caused the chatbot's AI personality to be 'sycophantic' CEO Sam Altman claims more fixes are coming We could see a personality selection option in ChatGPT in the future Following Sam Altman claiming ChatGPT 4o's personality had become 'annoying',

OpenAI CEO Sam Altman has confirmed that the company is rolling back its latest update to ChatGPT following widespread user complaints, including criticism that the AI had become overly “sycophantic” and,

OpenAI has pulled a ChatGPT update after users pointed out the chatbot was showering them with praise regardless of what they said. The firm accepted its latest version of the tool was "overly flattering",

OpenAI has pulled a ChatGPT update that users complained had turned the chatbot into a sycophantic yes-man unable to offer intelligent criticism. The company admitted that a recent GPT‑4o update was “overly flattering or agreeable” and that users can now use an older version “with more balanced behavior.