GPT-4o found a new function "Brush Edit", which supports one-click keying, changing clothes and background, and users can precisely modify the image by smearing the area and inputting commands; multiple user tests show that the function has strong ability to retain details, and it can complete the operations of changing clothes, adding accessories, and replacing the background, etc., but there is room for improvement in the effect of complex transformations; GPT-4o shows signs of inference ability, and users found that the model can display the inference time and thought chain process, indicating that OpenAI is merging inference and non-inference models or preparing for GPT-5. GPT-4o shows signs of reasoning ability, and users found that the model can display the reasoning time and the chain of thought process, which indicates that OpenAI is merging reasoning and non-reasoning models, or preparing for GPT-5.