Take this blind test to discover whether you truly prefer OpenAI's GPT-5 or the older GPT-4o—without knowing which model you're using.

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.

OpenAI has announced GPT-5 will replace all models on ChatGPT. Many users are mourning the workhorse model.