Opus 5.5 seems to have quietly gotten worse.
On top of usage limits draining ridiculously fast, the quality of its outputs now seems to be dropping too.
I've been getting a lot of comments about this, and I've seen several other posts reporting the same thing. It's starting to look like a widespread issue.
My guess is that Anthropic has been tweaking the harness or checkpoint so much that they ended up breaking something along the way.