Choose model lanes for a complex code migration by separating planning risk from repetitive editing.
A code migration failed when the team treated every step as cheap repetition. What changed in the corrected model plan? Before: speed picked before failure modes. After: plan, edit, and verify use different lanes. Planning separated from editing: deeper reasoning handles dependency mapping because the failure mode is hidden coupling, not typing speed. Repetition got a cheaper lane: once the edit pattern is proven, a workhorse model can apply it at lower cost. Benchmarks became gates: public coding scores shaped the shortlist, but local build, test, and review results decide rollout. The right model plan follows the risk shape of…
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