For almost a week, I have noticed a drop in performance in Opus 4.7. It is not following directions as well, often doing things well beyond what I asked it to do (which then has to be undone). It fabricated terminal commands and published them in my documentation. Skill files that are typically executed flawlessly are no longer being followed properly. Claude has been drawing wrong conclusions and showing a decline in its reasoning ability too. It even misspelled the word “probably” as “provably” during one session. My brother also reported a decline in performance for about the same time window. Surprisingly, I am not really seeing people post about their issues here, so I thought I’d explicitly ask. Are y’all having similar issues? In the past, this kind of degradation in performance typically came before the release of a new model. That, plus the release of new features in the harness has me wondering if we will be seeing a new release soon. Maybe Mythos is coming? submitted by /u/NoWorking8412
Originally posted by u/NoWorking8412 on r/ClaudeCode