LongReason: A Synthetic Long-Context Reasoning Benchmark via Context Expansion

• URL: http://arxiv.org/abs/2501.15089v1
• Date: Sat, 25 Jan 2025 05:32:14 GMT
• Title: LongReason: A Synthetic Long-Context Reasoning Benchmark via Context Expansion
• Authors: Zhan Ling, Kang Liu, Kai Yan, Yifan Yang, Weijian Lin, Ting-Han Fan, Lingfeng Shen, Zhengyin Du, Jiecao Chen,
• Abstract summary: LongReason is a synthetic benchmark for evaluating the long-context reasoning capabilities of large language models. LongReason consists of 794 multiple-choice reasoning questions with diverse reasoning patterns across three task categories. We evaluate 21 LLMs on LongReason, revealing that most models experience significant performance drops as context length increases.
• Score: 20.293369733522983
• License:
• Abstract: Large language models (LLMs) have demonstrated remarkable progress in understanding long-context inputs. However, benchmarks for evaluating the long-context reasoning abilities of LLMs fall behind the pace. Existing benchmarks often focus on a narrow range of tasks or those that do not demand complex reasoning. To address this gap and enable a more comprehensive evaluation of the long-context reasoning capabilities of current LLMs, we propose a new synthetic benchmark, LongReason, which is constructed by synthesizing long-context reasoning questions from a varied set of short-context reasoning questions through context expansion. LongReason consists of 794 multiple-choice reasoning questions with diverse reasoning patterns across three task categories: reading comprehension, logical inference, and mathematical word problems. We evaluate 21 LLMs on LongReason, revealing that most models experience significant performance drops as context length increases. Our further analysis shows that even state-of-the-art LLMs still have significant room for improvement in providing robust reasoning across different tasks. We will open-source LongReason to support the comprehensive evaluation of LLMs' long-context reasoning capabilities.

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