What, specifically, are you asking of these LLMs? "creative tasks" can be anything from programming to cooking recipes, so a tiny bit more specificality would be appreciated :)
I've used pretty much every major LLM out there for a specific type of creative writing, and none of them are as good at it as GPT4 with the exception of maybe Claude (Opus is actually probably even better regarding the sterility). Llama 3, even 70b, is definitely not better by any measure of actual quality - it's more random, at best.