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clarus_score.md

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+# Clarus Stability Score (CSS)
+
+The Clarus benchmark uses a unified score to compare model performance.
+
+---
+
+# CSS Definition
+
+CSS is defined as the mean F1 score across all datasets.
+
+CSS = mean(F1_i)
+
+where F1_i is the F1 score for dataset i.
+
+---
+
+# Transfer Stability Score (TSS)
+
+To evaluate reasoning transfer:
+
+TSS = mean(F1_transfer)
+
+Where F1_transfer measures performance when the training dataset differs from the testing dataset.
+
+---
+
+# Interpretation
+
+High CSS indicates strong performance across regimes.
+
+High TSS indicates the model has learned **stability reasoning rather than dataset-specific patterns**.