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Author

Zexin Li

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Jul 2026

When LLM Defenses Backfire: Characterizing Safety, Performance, and Cost Trade-offs

It is found that defenses rarely improve downstream capability, but instead vary in how they trade safety gains against usability and efficiency as well as performance impact, over-refusal on benign inputs, and inference cost.

Tong Zhang, Zexin Li, Simin Chen et al. · 0 citations
Preprint Aug 2026

MoEGen: Mixture-of-Experts for Instance-Adaptive LoRA Generation

This work proposes MoEGen, an adaptation framework that shifts MoE-based PEFT from expert selection to expert-conditioned parameter generation, and decouples expert capacity from adapter storage while enabling instance-conditioned adaptation.

Yiming Zeng, Lei Lu, Zexin Li et al. · 0 citations

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