STED and Consistency Scoring: A Framework for Evaluating LLM Structured Output Reliability
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909978005078016 |
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| author | Wang, Guanghui Yu, Jinze Zhang, Xing Jiang, Dayuan Song, Yin Deb, Tomal Liu, Xuefeng He, Peiyang |
| author_facet | Wang, Guanghui Yu, Jinze Zhang, Xing Jiang, Dayuan Song, Yin Deb, Tomal Liu, Xuefeng He, Peiyang |
| contents | Large Language Models (LLMs) are increasingly deployed for structured data generation, yet output consistency remains critical for production applications. We introduce a comprehensive framework for evaluating and improving consistency in LLM-generated structured outputs. Our approach combines: (1) STED (Semantic Tree Edit Distance), a novel similarity metric balancing semantic flexibility with structural strictness when comparing JSON outputs, and (2) a consistency scoring framework aggregating multiple STED measurements across repeated generations to quantify reliability. Through systematic experiments on synthetic datasets with controlled schema, expression, and semantic variations, we demonstrate STED achieves superior performance ($0.86-0.90$ similarity for semantic equivalents, $0.0$ for structural breaks) compared to existing metrics including TED, BERTScore, and DeepDiff. Applying our framework to benchmark six LLMs reveals significant variations: Claude-3.7-Sonnet demonstrates exceptional consistency, maintaining near-perfect structural reliability even at high temperatures ($T=0.9$), while models like Claude-3-Haiku and Nova-Pro exhibit substantial degradation requiring careful tuning. Our framework enables practical applications including targeted model selection for structured tasks, iterative prompt refinement for reproducible results, and diagnostic analysis to identify inconsistency root causes. This work provides theoretical foundations and practical tools for ensuring reliable structured output generation in LLM-based production systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_23712 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | STED and Consistency Scoring: A Framework for Evaluating LLM Structured Output Reliability Wang, Guanghui Yu, Jinze Zhang, Xing Jiang, Dayuan Song, Yin Deb, Tomal Liu, Xuefeng He, Peiyang Computation and Language Artificial Intelligence Large Language Models (LLMs) are increasingly deployed for structured data generation, yet output consistency remains critical for production applications. We introduce a comprehensive framework for evaluating and improving consistency in LLM-generated structured outputs. Our approach combines: (1) STED (Semantic Tree Edit Distance), a novel similarity metric balancing semantic flexibility with structural strictness when comparing JSON outputs, and (2) a consistency scoring framework aggregating multiple STED measurements across repeated generations to quantify reliability. Through systematic experiments on synthetic datasets with controlled schema, expression, and semantic variations, we demonstrate STED achieves superior performance ($0.86-0.90$ similarity for semantic equivalents, $0.0$ for structural breaks) compared to existing metrics including TED, BERTScore, and DeepDiff. Applying our framework to benchmark six LLMs reveals significant variations: Claude-3.7-Sonnet demonstrates exceptional consistency, maintaining near-perfect structural reliability even at high temperatures ($T=0.9$), while models like Claude-3-Haiku and Nova-Pro exhibit substantial degradation requiring careful tuning. Our framework enables practical applications including targeted model selection for structured tasks, iterative prompt refinement for reproducible results, and diagnostic analysis to identify inconsistency root causes. This work provides theoretical foundations and practical tools for ensuring reliable structured output generation in LLM-based production systems. |
| title | STED and Consistency Scoring: A Framework for Evaluating LLM Structured Output Reliability |
| topic | Computation and Language Artificial Intelligence |
| url | https://arxiv.org/abs/2512.23712 |