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.