GPT4 is so much better than 3.5 at virtually everything that I don't think it's worth trying to figure out which ones 3.5 is almost adequate enough for.
Also, the pricing is per token, so even with 4 it is close to negligible unless you are loading in a lot of context or your conversation gets very long.
Also, the pricing is per token, so even with 4 it is close to negligible unless you are loading in a lot of context or your conversation gets very long.