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Rom Himelstein

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#artificial intelligence Preprint Oct 2026

Generalization Is Stability, Not Accuracy: Multi-Axis Evaluation of LLMs

Generalization in large language models (LLMs) is the ability to produce consistent and semantically stable outputs when the same input is expressed in different ways. Existing work typically evaluates generalization through aggregate accuracy on a single prompt format, task, or set of variations, which conflates robus...

Nagham Omar, Mahmoud Jabarin, M. Rozenshteĭn et al. · 0 citations
#artificial intelligence Preprint Sep 2026

AnchorRep: Defending LLMs Against Cross-Model Adversarial Transfer via Representation Repulsion

Adversarial attacks optimized on a single open-weight LLM can transfer to and jailbreak architecturally different models, allowing an attacker with white-box access to one model to compromise independently deployed systems. This creates a shared vulnerability across models, yet existing defenses are not designed for th...

Gal Wertheizer, Rom Himelstein, Tomer Peretz et al. · 0 citations

Step-Wise Refusal Dynamics in Autoregressive and Diffusion Language Models

It is shown that diffusion remasking can promote recovery from harmful intermediate generations, provide evidence that this behavior is tied to the sampling mechanism, and demonstrate that switching from AR to diffusion sampling improves jailbreak robustness, including under fixed model weights.

Eliron Rahimi, Elad Hirshel, Rom Himelstein et al. · 2 citations
Jun 2026

Linguistic Firewall: Geometry as Defense in Multi-Agent Systems Routing

ANTAP (Automatic Non-Textual Agent Picker), an evaluation-driven routing architecture that discards indirect proxies in favor of active capability testing, is introduced, which distills performance into fixed behavioral operators within a shared semantic space.

Dvir Alsheich, Adar Peleg, Ben Hagag et al. · 0 citations

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