Brian Dobreski and Christopher Hastings write: “Libraries show an increasing interest in incorporating artificial intelligence (AI) tools into their workflows, particularly easily accessible and free-to-use chatbots. In this study, researchers sought to assess the performance of AI tools in performing basic subject heading and classification number assignment. Overall performance of these tools was poor, particularly for assigning classification numbers. Frequent sources of error included assigning overly broad numbers or numbers for incorrect topics. Although subject heading assignment was also poor, ChatGPT showed more promise here, backing up previous observations that chatbots may hold more immediate potential for this task.”