Questions exist as to whether AI tools, such as ChatGPT, can aid learning. This study examined whether in-class exercises involving error detection in text generated by ChatGPT can aid students' foreign language writing. Participants were Arabic-English speakers who were classified as ranging from modest to competent English users according to IELTS standards. There were two conditions, each involving four sections of an English communication course, distributed across consecutive semesters and taught by the same instructor. In the treatment condition (n = 101), students performed error detection exercises using text generated by ChatGPT. In the control condition (n = 112), students performed the same exercises without ChatGPT. Then, they wrote a descriptive essay. It was hypothesized that if ChatGPT exercises enhanced students' confidence as writers, they would write longer essays. If ChatGPT exercises enhanced attention to detail, the exercises would increase writing quality (e.g., greater use of low-frequency and abstract words, and greater reliance on complex syntactic structures). In this study, students exposed to ChatGPT exercises used more low-frequency words and wrote more sentences but of shorter length than control condition students. The number of words did not differ, suggesting that ChatGPT exercises enhanced writers' attention to the shorter sentence length of the English language and its vast vocabulary. The results of this study suggest that ChatGPT exercises yield minor benefits for improving the writing of second-language speakers. Yet, extensive and broader exercises may yield more substantial benefits. [For the complete proceedings, see ED672804.]