- In short
- The Sonnet-first heuristic is the discipline of starting every new workload on Sonnet and moving up the tier to Opus or down to Haiku only when a measured eval justifies the change. Moving up is warranted when an eval shows Sonnet fails to meet the quality bar; moving down is warranted when an eval confirms the quality tradeoff is acceptable. The point is to make tier changes evidence-driven rather than intuition-driven.
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