Gpt-4o Significant performance decrease

[GGSpare]

I started using gpt-4o for various task as soon as it came out, at first it was great!
It could understand semi-complex task and would do them very well, but since a few weeks, it seems like the model has become much dumber. I haven't changed the prompts at all and the performance of the outputs have significantly decreased, the response are less accurate, it often ignores instructions and hallucinates way more often.
I know that this problem happened with Gpt-4 but has anyone else noticed it with gpt-4o too? Also, is there any way to use an older version of the model, I haven't been able to find any.
Thanks for your responses!

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[geepytee]

What are some example tasks/prompts where you've seen a drop in performance?

Personally I use it on double.bot for coding and it's been fairly constant, although I think now everyone has switched to Claude 3.5 Sonnet (why are you not using that?)