Not that it was better at programming, but I really miss Sonnet 3.5 for educational discussions. I've sometimes considered that what I actually miss was the improvement 3.5 delivered over other models at that time. Though since my system message for Sonnet since 3.7 has been primarily instructing it to behave like a human and have a personality, I really think we lost something.
I still use 3.5 today in Cursor. It's still the best model they've produced for my workflow. It's twice as fast as 4 and doesn't vomit pointless comments all over my code.
