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#artificial intelligence Preprint Nov 2026

Length Is Cheap, Competition Is Not: Attention Predicts Context Rot in Retrieval

Why do language models fail on long inputs? The common answer is length. We show that, for retrieval, length is cheap and competition is not. On five open models (0.5B to 3B parameters, four families), neutral filler costs nothing: accuracy stays at 0.97 to 1.00, up to 32K tokens on Qwen2.5-1.5B. Statements in the form...

Yi-Nuo Liu · 0 citations
#artificial intelligence Preprint Oct 2026

There Is No Free Lunch in RLVR: Every pass@1 Gain Has a pass@k Price

It is proved that under exclusive specialization every update that raises pass@1 strictly lowers the success of some prompt; a strictly positive price on prompts (Stiemke duality) is the exact condition, and being merely the best strategy on a prompt is provably not enough.

Yi-Nuo Liu · 1 citation

WAInjectBench: Benchmarking Prompt Injection Detections for Web Agents

The key findings show that while some detectors can identify attacks that rely on explicit textual instructions or visible image perturbations with moderate to high accuracy, they largely fail against attacks that omit explicit instructions or employ imperceptible perturbations.

Yinuo Liu, Ruohan Xu, Xilong Wang et al. · 22 citations · ⚡1

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