Tl;DR - There's been a very strong degradation in the default language outputs of Opus 5. It's as though it's using english, but the english is weird. There's a fix!
It's not just you! Opus 5 is a "jargon douche"
Here's the thing, like with the GlazingGate of last year, these types of "issues" are hard to notice on a personal level. We don't often chat with Claude in front of others, and we don't often discuss the outputs of our chats, so noticing something like this requires.
So often, this requires someone else to share their experience, for you to say "oh, I've noticed this too, I thought it was just me!"
I first noticed this when testing Opus 5 over the weekend post release, but didn't really think about it much. After all, it was used to create full 3d games using @mattshumer_ Gauntlet prompt, and folks were focusing on performance and evaluations most of all.
