Cost management serves as a crucial driver for enterprise transformation and the development of new quality productive forces.Clarifying the value of enterprise cost information is pivotal in optimizing resource allocation.Cost uniqueness refers to the specific part of enterprise cost that is not affected by industry and market factors,which may bring potential audit risks and affect audit pricing.This study reveals that firm cost uniqueness contributes to an increase in audit pricing by elevating the level of audit risk and associated costs faced by auditors.Heterogeneity analysis finds that higher financial risk,R&D intensity and information asymmetry,lower audit expertise and shorter audit tenure,higher industrial competition and demand uncertainty can enhance the positive relationship between cost uniqueness and audit pricing.In addition,cost uniqueness reduces the comparability of accounting information among firms,and further deteriorates the information environment for external stakeholders.The conclusions of this paper contribute to the research on the relationship between cost characteristics and audit pricing,enrich the literature on the economic consequences of cost uniqueness,and provide reference for auditors to optimize audit procedures,for investors to improve decision-making performance,and for listed companies to improve cost management to achieve high-quality development.