The return of GPT-4o comes after what Altman described as OpenAI underestimating "how much some of the things that people like in GPT-4o matter to them." In an attempt to simplify its offerings, OpenAI had initially removed all previous AI models from ChatGPT when GPT-5 launched on August 7,

OpenAI updated GPT-5 to make it warmer and more familiar (in the sense of being friendlier) while taking care that the model didn’t become sycophantic, a problem discovered with

More than one user referred to GPT-4o as their soulmate, describing in detail how emotionally gutted they were when OpenAI initially took it down. These posts have been less common, but they offer some of the fiercest reactions to the model's disappearance.