StructFlowBench: A Structured Flow Benchmark for Multi-turn Instruction Following

Multi-turn instruction following capability constitutes a core competency of large language models (LLMs) in real-world applications.Existing evaluation benchmarks predominantly focus on fine-grained constraint satisfaction and domain-specific capability assessment, yet overlook the crucial structural dependencies between dialogue turns that distinguish multi-turn from single-turn interactions.These structural dependencies not only reflect user intent but also establish an essential second dimension for the instruction following evaluation beyond constraint satisfaction.To address this gap, we propose StructFlowBench, a multi-turn instruction following benchmark with structural flow modeling.The benchmark defines an innovative structural flow framework with six fundamental inter-turn relationships.These relationships introduce novel structural constraints for model evaluation and also serve as generation parameters for creating customized dialogue flows tailored to specific scenarios.Adopting established LLM-based automatic evaluation methodologies, we conduct systematic evaluations of 13 leading open-source and closedsource LLMs.Experimental results reveal significant deficiencies in current models' comprehension of multi-turn dialogue structures.The code is available at https://github.com/ MLGroupJLU/StructFlowBench.