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Mistral Large 4 drops from 38 to 25 on Artificial Analysis index after shift to private tests

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The Artificial Analysis v5 ranking, published 27 October 2026, weights 60% of its score to private or secret-response evaluations; twelve models with published weights lose 12–16 points and Mistral Large 4 falls to 25 points while Claude Opus 5.5 remains at 58.

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Artificial Analysis’s version 5 index uses private or secret-response tests for 60% of its score and removes three public subtests while adding two private benches; as a result twelve models with published weights drop by 12–16 points and the gap between top closed-model Claude Opus 5.5 (58) and the best published-weight models widens to 26 points.

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