Evaluating LLM-Generated Versus Human-Authored Responses in Role-Play Dialogues

• URL: http://arxiv.org/abs/2509.17694v2
• Date: Wed, 08 Oct 2025 23:27:45 GMT
• Title: Evaluating LLM-Generated Versus Human-Authored Responses in Role-Play Dialogues
• Authors: Dongxu Lu, Johan Jeuring, Albert Gatt,
• Abstract summary: This study compares LLM-generated and human-authored responses in multi-turn professional training simulations.<n>Human evaluation revealed significant degradation in LLM-generated response quality across turns.<n>Participants also indicated a consistent preference for human-authored dialogue.
• Score: 4.4260965078852275
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Evaluating large language models (LLMs) in long-form, knowledge-grounded role-play dialogues remains challenging. This study compares LLM-generated and human-authored responses in multi-turn professional training simulations through human evaluation ($N=38$) and automated LLM-as-a-judge assessment. Human evaluation revealed significant degradation in LLM-generated response quality across turns, particularly in naturalness, context maintenance and overall quality, while human-authored responses progressively improved. In line with this finding, participants also indicated a consistent preference for human-authored dialogue. These human judgements were validated by our automated LLM-as-a-judge evaluation, where Gemini 2.0 Flash achieved strong alignment with human evaluators on both zero-shot pairwise preference and stochastic 6-shot construct ratings, confirming the widening quality gap between LLM and human responses over time. Our work contributes a multi-turn benchmark exposing LLM degradation in knowledge-grounded role-play dialogues and provides a validated hybrid evaluation framework to guide the reliable integration of LLMs in training simulations.

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