OpenAI is investigating reports of a perceived decline in the performance of its GPT-5.5 model, following user feedback. Thibault Sottiaux from the OpenAI Codex team confirmed that the system is functioning normally, and no definitive conclusions have been drawn yet. CEO Sam Altman emphasized that similar past concerns often stemmed from increased user expectations rather than actual performance issues, and commended the team's proactive approach to addressing feedback.