Inverse Language Modeling towards Robust and Grounded LLMs

Davide Gabrielli; Simone Sestito; Iacopo Masi

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arXiv · 2510.01929

Inverse Language Modeling towards Robust and Grounded LLMs

Davide Gabrielli·Simone Sestito·Iacopo Masi

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Abstract

The current landscape of defensive mechanisms for LLMs is fragmented and underdeveloped, unlike prior work on classifiers. To further promote adversarial robustness in LLMs, we propose Inverse Language Modeling (ILM), a unified framework that simultaneously 1) improves the robustness of LLMs to input perturbations, and, at the same time, 2) enables native grounding by inverting model outputs to identify potentially toxic or unsafe input triggers. ILM transforms LLMs from static generators into analyzable and robust systems, potentially helping RED teaming. ILM can lay the foundation for next-generation LLMs that are not only robust and grounded but also fundamentally more controllable and trustworthy. The code is publicly available at github.com/davegabe/pag-llm.

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Davide Gabrielli, Simone Sestito, Iacopo Masi. 2025-10-02. Inverse Language Modeling towards Robust and Grounded LLMs. https://arxiv.org/abs/2510.01929

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