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.

OpenAI is updating GPT-5 to sound warmer and friendlier after users complained it was too formal compared to GPT-4o.

OpenAI CEO Sam Altman has admitted that the launch of GPT-5, the company’s most advanced AI model to date, did not unfold as planned. Speaking to reporters, Altman acknowledged the wave of criticism that followed the rollout and explained what the company is doing to regain user trust.

After releasing GPT-5 and removing the option for GPT-4o, OpenAI restored access to its older model after a deluge of unhappy user comments.

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.

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

OpenAI started rolling out GPT-5 to ChatGPT shortly after the AI system’s introduction last week. As part of the update, the company removed several of the chatbot service’s earlier LLMs. The move reportedly drew criticism from thousands of users, some of whom complained that GPT-5 provides lower output quality than its predecessor.

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