o3 is IMO, better than claude 4, at least for my usage. I usually give very precise context how to do coding both in scope and direction, in that case, o3 one-shot is very precise, compare to claude 4.
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I agree, I find o3 is unrivalled especially when it comes to the backend.
o3 is pretty good as counter to Claude Code. If CC fails, o3 can analyze, and make a plan.
One of the few reasons to keep Cursor around.