It's important to read company marketing statements as if you were a lawyer. We haven't made GPT-4 dumber != We haven't made ChatGPT(4) dumber.
Personal hypothesis is that they have made a few changes to ChatGPT recently - possibly quantization, and almost certainly some tweaks to make it give shorter/less detailed answers.
But by the nature of a probibalistic tool being run by a secretive company, it's hard to say for sure. Maybe I and everyone else complaining have just started to get unlucky answers.
Personal hypothesis is that they have made a few changes to ChatGPT recently - possibly quantization, and almost certainly some tweaks to make it give shorter/less detailed answers.
But by the nature of a probibalistic tool being run by a secretive company, it's hard to say for sure. Maybe I and everyone else complaining have just started to get unlucky answers.