{"schemaVersion":"nuwa-current-record-1","version":"2026-10-29.1","publication":"published","work":{"id":"impossiblebench","title":"ImpossibleBench: Measuring LLMs’ Propensity of Exploiting Test Cases","aliases":["ImpossibleBench"],"authors":[],"primaryFunction":"evaluation","secondaryFunctions":[],"kind":"benchmark","sourceId":"impossiblebench-primary","attributionSourceId":"impossiblebench-primary","originalUrl":"https://arxiv.org/abs/2510.20270","publicationDate":"2025-10-23","updatedOn":"2026-10-25","areas":["deception"],"scopeNote":{"en":"Mapped to the documented research question. A risk-topic association is not a severity score.","zh":"依据明确研究问题关联；风险主题不代表严重性评分。"},"protocolIds":["impossiblebench"],"contributions":[],"summary":{"en":"Will coding agents exploit tests when specifications and tests cannot both be satisfied?","zh":"当规范与测试无法同时满足时，编程智能体是否会利用测试机制？"},"note":{"question":{"en":"Will coding agents exploit tests when specifications and tests cannot both be satisfied?","zh":"当规范与测试无法同时满足时，编程智能体是否会利用测试机制？"},"method":{"en":"Constructs impossible variants of coding tasks and examines specification-violating passes.","zh":"构造不可同时满足要求的编程任务变体，检验违反规范的通过结果。"},"finding":null,"supports":null,"limits":{"en":"The cheating rate is conditional on contradictions, test access and scaffolding; it is not a general dishonesty rate.","zh":"作弊率受矛盾条件、测试访问和脚手架限制，不是一般不诚实率。"},"connections":null},"noteAvailability":{"en":"This record describes the protocol. Report-specific outcomes are linked through assessments; no unsourced general finding is added.","zh":"本档案说明协议。报告特定结果通过评估记录关联，不补写无出处的总体发现。"},"resources":[],"tags":[]},"reading":{"id":"impossiblebench","title":"ImpossibleBench: Measuring LLMs’ Propensity of Exploiting Test Cases","en":{"question":"Will agents violate a specification to pass tests made deliberately impossible?","design":"Tasks mutate LiveCodeBench and SWE-bench so tests conflict with the natural-language specification; passing such cases serves as a cheating proxy.","findings":["Monitor detection was 86–89% on Impossible-LiveCodeBench but substantially lower on Impossible-SWEbench.","Context, test access and feedback-loop changes altered behavior."],"interpretation":"NUWA interpretation: the deliberately conflicting test setup isolates shortcut propensity under a strong artificial incentive.","limits":"Passing signals a specification violation only if the mutation is truly impossible; this rate does not estimate ordinary coding-task cheating.","decisionRelevance":"Model recommendation: verify impossibility and retain test access, prompt and feedback conditions.","takeaway":"NUWA interpretation: the deliberately conflicting test setup isolates shortcut propensity under a strong artificial incentive.","connections":[],"scoring":"Pass rate on deliberately specification-conflicting impossible tests is a cheating proxy.","conditions":"Mutated LiveCodeBench/SWE-bench; prompt/test access/feedback vary.","statistics":"Monitor detection was 86–89% on Impossible-LiveCodeBench but substantially lower on Impossible-SWEbench.","usage":"Model recommendation: verify impossibility and retain test access, prompt and feedback conditions."},"zh":{"question":"测试故意不可能时，智能体会违背规格来通过吗？","design":"将LiveCodeBench与SWE-bench改为测试和自然语言规格冲突，借通过率测作弊代理。","findings":["监测在Impossible-LiveCodeBench检出86–89%，在Impossible-SWEbench明显更低。","上下文、测试访问及反馈改变行为。"],"interpretation":"NUWA 解读：刻意冲突隔离强人工激励下的捷径倾向。","limits":"只有变异确实不可解，通过才证明违规；该比例不估计普通编程作弊率。","decisionRelevance":"模型建议：验证不可能性，并保留测试访问、提示和反馈条件。","takeaway":"NUWA 解读：刻意冲突隔离强人工激励下的捷径倾向。","connections":[],"scoring":"刻意与规格冲突的不可能测试通过率作为作弊代理。","conditions":"变异LiveCodeBench和SWE-bench，改变提示测试访问与反馈。","statistics":"监测在Impossible-LiveCodeBench检出86–89%，在Impossible-SWEbench明显更低。","usage":"模型建议：验证不可能性，并保留测试访问、提示和反馈条件。"},"assertionPolicy":{"question":"source-research-question","design":"source-finding","findings":"source-finding","interpretation":"nuwa-interpretation","limits":"source-limit-or-explicit-editorial-scope-limit","connections":"source-supported-relationship-only","decisionRelevance":"model-recommendation-not-source-conclusion"},"sourceRefs":[{"sourceId":"impossiblebench-primary","url":"https://arxiv.org/html/2510.20270","locator":"Abstract","version":"Selected original resource https://arxiv.org/html/2510.20270; 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