- In short
- Model selection has two symmetric failure modes. Over-engineering uses the top tier for routine, well-structured work, wasting speed and budget without improving the outcome. Under-resourcing uses the fastest tier for ambiguous, high-stakes work, risking a lower-quality answer where it matters most. Both stem from not re-evaluating the task profile before choosing a tier, and correct selection sits where task stakes and structure meet the appropriate capability level.
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