Integrating artificial intelligence (AI) in education has transformed traditional teaching by providing interactive and personalized learning opportunities. This study investigates the impact of Chat-GPT, an advanced language model, on improving English writing skills among 10 secondary school students in Ambon City, Maluku, Indonesia. Utilizing a mixed-methods approach, the research incorporated qualitative interviews, surveys, and quantitative analysis of students’ writing portfolios to evaluate the effectiveness of AI-generated feedback. The results revealed that Chat-GPT significantly enhanced students’ writing skills through personalized, real-time feedback, which led to notable improvements in grammar, vocabulary, and self-editing capabilities. Principal component analysis (PCA) identified three key factors contributing to skill development: (1) overall improvement in writing quality, including better coherence and creativity; (2) technical proficiency in grammar, sentence structure, and editing; and (3) user satisfaction with the platform and the perceived value of its feedback. Furthermore, correlation analysis demonstrated a positive association between frequent Chat-GPT use and enhanced coherence and technical precision in written work. Qualitative feedback highlighted students’ appreciation for contextualized, interactive feedback and a preference for features supporting real-time collaboration. The study advocates for the responsible integration of AI in education to foster self-directed learning and improve linguistic competencies.