I saw a few (Claude Sonnet 4.6), easily fixed. The biggest difference I’ve noticed is that when you say it has screwed up it much less likely to go down a hallucination path and can be dragged back.

Having said that, I’ve changed the way I work too: more focused chunks of work with tight descriptions and sample data and it’s like having a 2nd brain.

Very good way to describe it. I am enjoying Opus a lot.