I have used claude code a ton and I agree, I haven't noticed a single difference since updating. Its summaries I guess a little cleaner, but its has not surprised me at all in ability. I find I am correcting it and re-prompting it as much as I didn't with 3.7 on a typescript codebase. In fact I was kind of shocked how badly it did in a situation where it was editing the wrong file and it never thought to check that more specifically until I forced it to delete all the code and show that nothing changed with regards to what we were looking at.

I'd go so far as to say Sonnet 3.5 was better than 3.7

At least I personally liked it better.