It is (slower), especially at xhigh setting. But if I have to redo things three times, keep confirming trivial stuff (Claude Code seems to keep changing the commands it uses to read code... once it uses "bash-read", once it uses "tree", once it uses "head" and I have to keep confirming permission), I definitely waste more time than give a command to codex (or in my case OpenCode + codex model) and come back after 10 minutes.