---
title: "Mark Ibrahim — papers of 2025 — 1 paper, the most cited first"
description: "Mark Ibrahim — papers of 2025: 1 paper on Elamur Research, the most cited first — what each work is about in our own words."
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# Mark Ibrahim — papers of 2025 — 1 paper, the most cited first

1 paper · [all years of Mark Ibrahim](https://md.research.elamur.ai/free/en/authors/mark-ibrahim/#years)

**[AbstentionBench: Reasoning LLMs Fail on Unanswerable Questions](https://md.research.elamur.ai/free/en/papers/kirichenko-2025-abstentionbench-reasoning-llms-fail-unanswerable/) [Conference on Neural Information Processing Systems (NeurIPS)](https://md.research.elamur.ai/free/en/venues/neural-information-processing-systems/)**Polina Kirichenko, Mark Ibrahim, Kamalika Chaudhuri, et al.*2025 · 35 citations*