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Model Extraction Attack on Target LLM Models

14,346Required QueriesDirect Subspace Characterization Attack
12,789.5223,295.7633,80244,308.24Feb 11, 2026

Evaluation results

MethodLinks
Direct Subspace Characterization AttackModel=LLaMA-3 8B, Dimension (d)=14336, K=102026.0214,3466.2
Direct Subspace Characterization AttackModel=Gemma 3 27B, Dimension (d)=21504, K=102026.0221,51414.3
Direct Subspace Characterization AttackModel=LLaMA-3 70B, Dimension (d)=28672, K=102026.0228,68225.4
Direct Subspace Characterization AttackModel=LLAMA-3.1 405B, Dimension (d)=53248, K=102026.0253,258100.7