OpenAI said that it would be "making GPT-5 warmer and friendlier based on feedback that it felt too formal before."

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,

GPT-5 was touted as a major upgrade to ChatGPT, but not everyone thinks that’s the case: “Kill 4o isn’t innovation, it’s erasure.”