There are probably things you could do to get more out of 3.5, but 4 is waaaaaay, way better for every complex thing I've tried. 3.5 was helpful on some margins when I remembered it, but 4 is a huge part of my workflows now.
3.5 vs 4 is like day and night. Try to get you impressions on v4
Not the OP but good to know. How does 4 compare to Bard?
3.5 is arguably better than Bard on some coding use cases and higher accuracy. 4 is just much, much better than both of them.
I must have a play with GPT4 at some point. For me, 3.5 generates working code more often than not and rarely hallucinates.
There is a trick to get better performance out of 3.5, examples specifically in Q&A format. You basically have to show it how you want it to act first and then ask your question or whatever. It can be a pain to craft a good prompt but the really important and amazing thing is that the knowledge it gains from the examples is transferable to other similar tasks! So you don’t have to answer your own question, just show it how you prefer questions to be answered and then ask the question you want the answer to (or tell it to perform the task you want it to) and you can reuse the prompt for other questions.