Unlike OP, from my still limited but intense month or so diving into this topic so far, I had better luck with Gemini 2.5 PRO and Opus 4 on more abstract level like architecture etc. and then dealing input to Sonnet for coding. I found 2.5 PRO, and to a lesser degree Opus, were hit or miss; A lot of instances of them circling around the issue and correcting itself when coding (Gemini especially so), whereas Sonnet would cut to the chase, but needed explicit take on it to be efficient.
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