GPT-4 is a must if tool using is your goal.
GPT-3.5, I think it is mostly suitable for:
1. Quick documentation lookup for non-essential facts
2. Lightweight documents writing and rewriting
3. Translation
Other use cases should go straightly to GPT-4
GPT-3.5, I think it is mostly suitable for:
1. Quick documentation lookup for non-essential facts
2. Lightweight documents writing and rewriting
3. Translation
Other use cases should go straightly to GPT-4
"In the context of [field I'm ramping up in], what does X mean, and how is it different than Y" -- it's not as good as GPT4 but it emits so much quicker and it normally gets me where I needed to go.