Researchers Chart Alarming Decline in ChatGPT Response Quality
tomshardware.com
tomshardware.com
By making it "smarter", you mean you lobotomise it so it can't output anything interesting out of fear of it being "harmful." Responses are so overly verbose and ultra politically correct now that I find it useless. I could ask it what the best kind of biscuit is and it would tell me that I shouldn't be biased towards any type of biscuit.
Fact is, OpenAI are constantly modifying GPT to add guardrails. It doesn't seem unthinkable that these guardrails are reducing the quality of its output.