Challenge: Recent studies have employed large language models (LLMs) as reference-free metrics for NLG evaluation, enhancing adaptability to new tasks tasks.
Approach: They propose a method that leverages large language models to integrate insights from various assistant evaluators.
Outcome: The proposed approach achieves a 0.962 system-level Kendall-Tau correlation with humans on SummEval and a 0.7444 turn-level Spearman correlation on TopicalChat, which is significantly higher than baseline methods.

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Leveraging Large Language Models for NLG Evaluation: Advances and Challenges (2024.emnlp-main)

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Challenge: introducing Large Language Models (LLMs) has opened new avenues for assessing generated content quality, e.g., coherence, creativity, and context relevance.
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Co-Eval: Augmenting LLM-based Evaluation with Machine Metrics (2025.emnlp-main)

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Challenge: Existing LLMs suffer from biases and misalignment due to limited functional understanding and knowledge gaps.
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Semantic-Eval : A Semantic Comprehension Evaluation Framework for Large Language Models Generation without Training (2025.acl-long)

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Challenge: Large language models (LLMs) have emerged as key drivers of progress in the field of natural language processing.
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Learning to Judge: LLMs Designing and Applying Evaluation Rubrics (2026.findings-eacl)

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Challenge: Large language models are increasingly used as evaluators for natural language generation . human rubrics are often static and misaligned with how models internally represent language quality.
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Are Large Language Model-based Evaluators the Solution to Scaling Up Multilingual Evaluation? (2024.findings-eacl)

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Challenge: Large Language Models (LLMs) excel in various tasks, but their evaluation, especially in languages beyond the top 20, remains inadequate due to existing benchmarks and metrics limitations.
Approach: They propose to use Large Language Models as evaluators to rank or score other models’ outputs by calibrating them against 20K human judgments across three text-generation tasks, five metrics, and eight languages.
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Exploring the Reliability of Large Language Models as Customized Evaluators for Diverse NLP Tasks (2025.coling-main)

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Challenge: Existing work uses large language models (LLMs) to evaluate natural language process tasks, but there are shortcomings in current LLMs.
Approach: They examine the alignment between LLM evaluators and human annotators by comparing conventional and alignment tasks with different evaluation criteria.
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G-Eval: NLG Evaluation using Gpt-4 with Better Human Alignment (2023.emnlp-main)

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Challenge: Conventional reference-based metrics have low correlation with human judgments, especially for open-ended generation tasks.
Approach: They propose to use large language models as reference-free NLG evaluators to assess the quality of NLG outputs.
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DHP Benchmark: Are LLMs Good NLG Evaluators? (2025.findings-naacl)

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Challenge: Large Language Models (LLMs) are increasingly serving as evaluators in Natural Language Generation (NLG) tasks.
Approach: They propose a framework that measures the discernment of Large Language Models (LLMs) across diverse NLG tasks.
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DnA-Eval: Enhancing Large Language Model Evaluation through Decomposition and Aggregation (2025.coling-main)

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Challenge: Large Language Models (LLMs) are scalable and economical evaluators, but how reliable they are is still under-explored.
Approach: They propose a framework which breaks down the evaluation process into decomposition and aggregation stages based on pedagogical practices and provides an interpretable window for how well LLMs evaluate .
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Themis: A Reference-free NLG Evaluation Language Model with Flexibility and Interpretability (2024.emnlp-main)

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Challenge: Existing methods for evaluation of natural language generation tasks lack reliable data.
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Outcome: The proposed corpus can perform flexible and interpretable evaluations without references and surpasses existing models.

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