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Equation 6 · Measuring Frontier Models: Contamination, Variance, and What a Score Can Support

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D\mathcal{D}

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D\mathcal{D}

Symbol D

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The number is only as good as three things: whether Dbench\mathcal{D}_{\mathrm{bench}} resembles D\mathcal{D} , whether the xix_i are genuinely held out, and whether the indicator is measured with enough repetition to characterise its spread. All three fail routinely, and they fail in different directions.

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