Writing skill is one of the most challenging aspects for many EFL (English as a Foreign Language) students, especially in expressing ideas clearly and organizing them into well-structured texts. Therefore, this study aimed to investigate the effectiveness of integrating ChatGPT with the Think-Pair-Share (TPS) method in improving students’ writing achievement and to explore their perceptions of the approach at Madrasah Aliyah Jamia’tul Qurro’. A quasi-experimental design was used with two groups: an experimental group taught using ChatGPT combined with TPS, and a control group taught using conventional methods. The participants were 58 tenth-grade students selected through purposive sampling, with 29 students in each group. Data were collected through pre-tests and post-tests to measure students’ writing performance, and a questionnaire to analyze their perceptions. Writing test data were analyzed using paired sample t-test and independent sample t-test through SPSS version 27. The results showed that the p-value of the paired sample t-test was 0.000 (p < 0.05), indicating a significant improvement in students’ writing scores after being taught with the integration of ChatGPT and TPS. The independent sample t-test also showed a p-value of 0.000 (p < 0.05), confirming a significant difference in writing achievement between the experimental and control groups. The questionnaire results revealed that students in the experimental group responded positively, stating that the integration of ChatGPT and TPS helped them generate ideas more effectively, improve their grammar, and receive instant feedback. These findings suggest that the combination of ChatGPT and the TPS method is an effective approach to enhancing descriptive writing skills among EFL students.