We built TamperBench, a unified framework for evaluating the tamper resistance of open-weight LLMs, addressing the lack of standardized benchmarks in this area. It evaluates 21 models across nine attack types with systematic hyperparameter sweeps, covering both safety and utility metrics. Key findings include that jailbreak-tuning is generally the most severe attack and that Triplet is the strongest alignment-stage defense.
February 5, 2026
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