I think “Claude Code silently auto-updated overnight and the workflow which had been working for me stopped working” is a pretty common experience. On the claude.ai web side of things, the length of the reasoning blocks definitely shifted sometime in the last few weeks, in a way that is not subtle at all. I don’t know if either of those count as “nerfing the model”—strictly speaking they probably don’t—but they definitely both constitute nerfs to the experience of using the model.
I think “Claude Code silently auto-updated overnight and the workflow which had been working for me stopped working” is a pretty common experience. On the claude.ai web side of things, the length of the reasoning blocks definitely shifted sometime in the last few weeks, in a way that is not subtle at all. I don’t know if either of those count as “nerfing the model”—strictly speaking they probably don’t—but they definitely both constitute nerfs to the experience of using the model.