- In short
- Model mismatch occurs when the chosen model tier is wrong for the task complexity, or a model was swapped without re-evaluation. The fix is model selection gated by an eval run, not a prompt adjustment. Swapping models without re-running the eval suite risks silently reintroducing a previously-fixed failure class. Each failure class, prompt failure, hallucination, and model mismatch, maps to a distinct fix category: a prompt edit, a grounding mechanism, or an eval-gated model change.
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