Unrelated to the models
fwiw, i think almost all regressions are down to a/b testing in the harness by anthropic, but it is objectively indistinguishable beyond "the coding agent ceases to be usable" and i'm back to traditional coding for a few hours until its back to normal again
It absolutely matters because something like Claude Code has no guarantee that there won't be changes between updates but a model pinned at the API version level that is getting enterprise traffic absolutely does have that guarantee and would be a much more widespread problem...
The /r/antigravity SubReddit is full of users who very much notice bugs with the tool/agent. We should be thankful that Claude Code is pretty stable by comparison.