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The Metaverse is rapidly advancing, creating new ways to connect real and digital spaces. In Digital Cultural Heritage, technologies such as Artificial Intelligence, eXtended Reality, and Digital Twins are transforming how cultural knowledge is preserved and experienced. Cyber-Physical-Social Systems (CPSS) provide a foundation for such applications, yet the role of Large Language Models (LLMs) in these systems remains underexplored. This paper presents the architecture and development of a CPSS-based virtual museum prototype and reports on a comparative evaluation of LLM integration for contextual information delivery. We fine-tuned Mistral 7B with LoRA on domain-specific data and compared it against the baseline model through expert human evaluation on factual accuracy, relevance, safety, alignment, and formatting. Results show the fine-tuned model outperformed the baseline by ≡+5.5%, particularly in accuracy, contextual relevance, and response formatting. These findings demonstrate the value of tailored LLMs as a core component of CPSS for enhancing digital heritage experiences and create new ways for future exploration of additional models and approaches.
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