Ah, I feel you! I went down that exact rabbit hole not long ago, comparing ChatGPT 3.5 and 4.0 for content analysis. I initially stuck with 3.5 because, like you said, it was solid for basic stuff. But then, as I got deeper into analysis, I noticed it’d gloss over some of the nuanced themes and sentiment shifts in my content. It wasn’t until I tried 4.0 that I really noticed the difference – it caught subtleties that 3.5 would miss, which made my life so much easier.
If you’re looking for a detailed breakdown of what each version is capable of, https://uuusoftware.com/blog/chatgpt-35-vs-40 has a pretty good comparison. It might help you decide if the upgrade’s worth it. Good luck with your analysis – it’s definitely a game of finding the right tool for the job!