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Benchmark Contamination: A Taxonomy Organized by Defeated Mitigation

A new taxonomy classifies LLM benchmark contamination by which countermeasures each leakage technique defeats—valuable for procurement teams validating vendor capability claims.

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Filed by arXiv Crypto & Security1 min readRead at source ↗

arXiv:2608.29463v1 Announce Type: new Abstract: A benchmark score is a joint property of the model, the evaluation harness, the elicitation budget, the sampled population, and contamination status. Leaderboards publish the model and the score, so capability and leakage stay observationally equivalent. Existing taxonomies classify contamination for automated detection, not the question a reporter faces at publication: given the mitigations already applied, which validity threats remain open? We

Editorial Analysis

Why it matters

Enterprises procuring foundation models risk relying on inflated benchmark scores; a contamination taxonomy helps CISOs and architects ask sharper questions during vendor evaluation.

Forward-looking interpretation drafted by editorial AI under human review — not a reproduction of the source. See methodology.

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