https://platform.openai.com/docs/models
Continuous model upgrades
chatgpt-4o-latest model version continuously points to the version of GPT-4o used in ChatGPT, and is updated frequently. With the exception of chatgpt-4o-latest, we offer pinned model versions that developers can continue using for at least three months after an updated model has been introduced.
而且如果你都用过且比较熟悉的话就会知道网页版不可能是 5 月份那个模型。