Yes
I found a deadlock but when I switched back to CC the Codex review had found the deadlock and Claude Code was already working on a fix
linsomniac on Hacker News
In the thread “Claude Code Found a Linux Vulnerability Hidden for 23 Years”, replying to this comment
Helped: Using Codex to review commits and find bugs like deadlocks.
… One particularly striking example: I had CC do some work and then kicked off a "/codex-review" and while it was running went to test the changes. I found a deadlock but when I switched back to CC the Codex review had found the deadlock and Claude Code was already working on a fix.