The general consensus I've seen for Opus 5 on the various Claude subreddits is to only use it in low or medium effort.
I've reverted to Opus 4.8 for most of my work. It's crazy that Opus 5 was lauded at release for scoring so highly on benchmarks.
This was one of the few times I tried Max, and the problem was the code (it listed as a "hole") was directly adjacent to the problem area, and not especially complex.
Kind of like looking at a washing machine and telling the customer to be careful because the inlet pipe will pump water into an empty box.
So I guess the washing machine analogy is that you've somehow added too much detergent because the new formula is 3x as strong, and your clothes are very clean, but the fibres have also degraded leaving your clothes a bit threadbare.
I run things through grok to make them positive again after claude does the main work