GLM-5.3 does the same, funnily enough.

I gave it some vibecoded patch someone created with Opus 5 with the task of together figuring out the real root cause and what to do about it.

Big mistake. The rest of the session was all claude-speak up until I've rage-quit and restarted with Qwen and no context other than "here's what I think we've missed in the current implementation. How could we approach that?"

GLM felt like it got at least 20 IQ points dumber just from being exposed to claude's writing.