The study aimed to (i) explore the effectiveness of Artificial Intelligence (AI) models like Chat GPT to facilitate English language learning among Thai students in Higher education and (ii) compare the English Language Learning effectiveness among Thai Students after implementing artificial intelligence (AI) like Chat GPT to facilitate English language learning. The participants were Thai students aged 19-20 from first-year pre-service teachers in Bangkok. A total of 120 students participated, 60 in the control and 60 in the experimental group. The selection of participants was done through stratified random sampling to ensure a diverse representation of pre-service teachers with varying levels of English proficiency. We utilized a mixed-methods approach that combined qualitative and quantitative data: Standardized English tests, Chat GPT, focus group interviews, and field notes. The research instruments were (i) Standardized English Tests, (ii) Chat GPT, (iii) Focus Group interview questions, and (iv) Field Notes Form. The research findings strongly advocated integrating AI tools like Chat GPT in educational settings to facilitate more effective language learning. The study demonstrates that students who interacted with AI improved their language skills. A paired sample t-test revealed that this difference between control and experimental groups was statistically significant (p < 0.001). Feedback from the focus group interviews indicated that students in the experimental group. After implementing artificial intelligence (AI) like Chat GPT, the AI-based learning experience increased engagement, personalization, real-time feedback, attitude change, and learning motivation. They reported that the real-time feedback and interactive exercises offered by Chat GPT helped them understand and apply language concepts more effectively. Lastly, the attitude changes because the students had high motivation, strong self-confidence, and a positive attitude shift.