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arXiv · 2502.09316

A Judge-free LLM Open-ended Generation Benchmark Based on the Distributional Hypothesis

Kentaro Imajo·Masanori Hirano·Shuji Suzuki·Hiroaki Mikami
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Abstract

Evaluating the open-ended text generation of large language models (LLMs) is challenging because of the lack of a clear ground truth and the high cost of human or LLM-based assessments. We propose a novel benchmark that evaluates LLMs using n-gram statistics and rules, without relying on human judgement or LLM-as-a-judge approaches. Using 50 question and reference answer sets, we introduce three new metrics based on n-grams and rules: Fluency, Truthfulness, and Helpfulness. Our benchmark strongly correlates with GPT-4o-based evaluations while requiring significantly fewer computational resources, demonstrating its effectiveness as a scalable alternative for assessing LLMs' open-ended generation capabilities.

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Kentaro Imajo, Masanori Hirano, Shuji Suzuki, Hiroaki Mikami. 2025-02-13. A Judge-free LLM Open-ended Generation Benchmark Based on the Distributional Hypothesis. https://arxiv.org/abs/2502.09316

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