Anecdotally, I have also felt many of these same complaints.

In my case, I have a semi-autonomous loop where Claude writes some code, and uses `codex exec` to do an adversarial review. I had what should have been a trivial feature go for 13 rounds of review/fix before I stopped it, where each round was just flip-flopping the same logic back and forth to try to make the tests pass. Codex kept (correctly) re-identifying the issues Claude was flip-flopping on. Codex even suggested fixes that would have worked; Claude ignored them repeatedly. I never saw anything remotely this bad on Opus 4.8.

Additionally, I have a CLAUDE.md instruction to not silently defer anything, and ask me anytime it wants to do so. Opus 4.8 paid attention to this rule the overwhelming majority of the time. Opus 5 seemingly cannot be bothered.

I have tried updating my CLAUDE.md according to Anthropic’s recommendations for Opus 5, but it doesn’t seem to have made any difference.