what i found to work well with me is Fable for design / ideas and Sol for implementation. Codex models just tend to be more attentive and follow through instructions. Whereby claude models are weaker on this area (they tend to cut corners).
But I actually prefer it this way. Sol is a master of overengineering and being overly scrupulous, so Fable balances this out, and I can always say "don't listen to Sol's advisory" about 50% of the time.