The use of Artificial Intelligence (AI) and digital resources in developing sustainable English language teaching (ELT) materials is increasingly relevant in developing countries. Although various studies have discussed the integration of technology in education, there is still a gap in the use of AI and digital resources to create contextual and sustainable ELT materials. This research aims to examine the extent to which AI and digital resources assist English teachers in developing adaptive and sustainable ELT materials. This research employed a descriptive qualitative approach, employing in-depth interviews and field observations with 25 teachers across various regions in Indonesia. Data were analyzed thematically using NVivo 15 software to identify key patterns in material development practices. Research findings showed that AI and digital resources could accelerate the material creation process, adapt the level of difficulty to students’ abilities, and incorporate local cultural context into learning content. Teachers can also utilize AI to develop various materials for classroom practice. The research results also indicated that teachers had inadequate facilities and were incompetent in using the latest technology. Nevertheless, teachers are confident that they can maximally use AI to develop sustainable ELT materials. Therefore, the support from relevant stakeholders is needed through various constructive policies and training in using AI and digital resources for ELT materials development. Despite the obstacles faced, teachers are advised to optimally use AI and digital resources to develop quality ELT materials that meet the needs of the twenty-first century.