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arXiv · 2511.14195

N-GLARE: An Non-Generative Latent Representation-Efficient LLM Safety Evaluator

Zheyu Lin·Jirui Yang·Yukui Qiu·Hengqi Guo·Yubing Bao·Yao Guan
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Abstract

Evaluating the safety robustness of LLMs is critical for their deployment. However, mainstream Red Teaming methods rely on online generation and black-box output analysis. These approaches are not only costly but also suffer from feedback latency, making them unsuitable for agile diagnostics after training a new model. To address this, we propose N-GLARE (A Non-Generative, Latent Representation-Efficient LLM Safety Evaluator). N-GLARE operates entirely on the model's latent representations, bypassing the need for full text generation. It characterizes hidden layer dynamics by analyzing the APT (Angular-Probabilistic Trajectory) of latent representations and introducing the JSS (Jensen-Shannon Separability) metric. Experiments on over 40 models and 20 red teaming strategies demonstrate that the JSS metric exhibits high consistency with the safety rankings derived from Red Teaming. N-GLARE reproduces the discriminative trends of large-scale red-teaming tests at less than 1\% of the token cost and the runtime cost, providing an efficient output-free evaluation proxy for real-time diagnostics.

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Zheyu Lin, Jirui Yang, Yukui Qiu, Hengqi Guo, Yubing Bao, Yao Guan. 2025-11-18. N-GLARE: An Non-Generative Latent Representation-Efficient LLM Safety Evaluator. https://arxiv.org/abs/2511.14195

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