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DeclineCraft: A RAG Abstention Benchmark for Jointly Measuring Combined Retrieval and Parametric Knowledge

Atharva Thakur, Abulhair Saparov, Bruno Ribeiro · 2026 · arXiv

DOI: 10.48550/arXiv.2610.28340 · open-access PDF

German

Wir stellen DeclineCraft ein, einen dynamischen Abstinenz-Benchmark, dessen unbeantwortete Fragen auf Minecraft-Feature-Additions nach einem Corpus-Cut-off abzielen, mit Audits der möglichen parametrischen Exposition. Spätere Cut-offs unterstützen die Bewertung zukünftiger Modelle. Über 27 LLMs messen wir Correct Abstention Rate (CAR; wie oft Modelle unzureichende Kenntnisse über unbeantwortete Fragen erkennen), Answerbare Versuchsrate und Antwortgenauigkeit.

Machine translation (Meta M2M100); the English original follows.

Abstract

Reliable retrieval-augmented generation (RAG) requires recognizing when neither retrieved documents nor parametric knowledge supports an answer. We introduce DeclineCraft, a dynamic abstention benchmark whose unanswerable questions target Minecraft feature additions after a corpus cut-off, with audits of possible parametric exposure. Later cut-offs support evaluation of future models. Across 27 LLMs, we measure Correct Abstention Rate (CAR; how often models acknowledge insufficient knowledge on unanswerable questions), Answerable Attempt Rate and Answer Accuracy. We find that (1) single-shot r

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