SLAM: Structural Linguistic Activation Marking for Language Models

📰 ArXiv cs.AI

arXiv:2605.05443v1 Announce Type: cross Abstract: LLM watermarks must be detectable without compromising text quality, yet most existing schemes bias the next-token distribution and pay for detection with measurable quality loss. We present SLAM (Structural Linguistic Activation Marking), a novel white-box watermarking scheme that sidesteps this cost by writing the mark into structural geometry rather than token frequencies: sparse autoencoders identify residual-stream directions encoding lingui

Published 9 May 2026

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Title: SLAM: Structural Linguistic Activation Marking for Language Models

Abstract:
arXiv:2605.05443v1 Announce Type: cross Abstract: LLM watermarks must be detectable without compromising text quality, yet most existing schemes bias the next-token distribution and pay for detection with measurable quality loss. We present SLAM (Structural Linguistic Activation Marking), a novel white-box watermarking scheme that sidesteps this cost by writing the mark into structural geometry rather than token frequencies: sparse autoencoders identify residual-stream directions encoding lingui
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