If all you are doing is chatting with the model, they're effectively the same. If you are actually building agentic workflows, they differ immensely in supporte

If all you are doing is chatting with the model, they're effectively the same. If you are actually building agentic workflows, they differ immensely in supported features. Codex doesn't support subagent personalities, for example, and until this week Claude Code didn't support generating structured responses.