Is "Claude Opus as main model" cost-effective for you and why?

I would like to hear from those who are using Opus 4.6 on a regular basis and may have even started using Opus 4.6 Fast, and still find it cost effective.

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will watch this thread, since Codex 5.3 out, i always rely on it almost everytask. Especially after Cursor have access on Codex 5.3