GPT-4 is not aware of its existence - works like GPT-3.5

Though I get the options for ChatGPT-3.5 legacy, ChatGPT3.5 default and GPT-4 in the drop down options as a Plus/paid subscriber,

  • GPT-4 works like ChatGPT-3.5 default. I don’t see the difference in the response I get from the two.
  • When I ask GPT-4 model what makes it different from ChatGPT-3.5 default, it is not aware of itself. It instead tells me that "…[a]s of my last knowledge update in September 2021, the latest version of the model is GPT-3.5-turbo…OpenAI has not officially released a “GPT-3.5 default” or “GPT-3.5 legacy” model. GPT-3.5-turbo is an enhanced version of GPT-3

What is going on, please?

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