Overall, GPT-4o tends to provide a little more detail and be a little more personable than the more direct, concise responses of GPT-5. Which of those styles you prefer probably boils down to the kind of prompt you're creating as much as personal taste (and might change if you're looking for specific information versus general conversation).

OpenAI has reinstated GPT-4o as a default model option for paid ChatGPT subscribers, reversing a controversial change made during last week’s release of GPT-5. CEO Sam Altman announced the GPT-4o move on Wednesday, along with other updates to the company’s AI chatbot.

For now, the changes should help placate users who felt frustrated by the sudden shift to GPT-5 and deprecation of OpenAI's older LLMs.

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,

After an outcry, OpenAI swiftly rereleased 4o to paid users. But experts say it should not have removed the model so suddenly.

OpenAI CEO Sam Altman said that he has taken notice of how attached some users have become to specific AI models.

OpenAI’s GPT-5 aims to curb AI hallucinations and deception, raising key questions about trust, safety, and transparency in large language model assistants.

OpenAI released GPT-5, the long-awaited upgrade to the model which powers ChatGPT, Thursday. In typical OpenAI fashion, the release has included plenty of twists, turns, and drama.