ChatGPT has become a significant topic of interest in the field of education, prompting of the potential applications of such technology. The utilization of ChatGPT may facilitate the fostering of 21st century skills, such as computational thinking (CT) and technology, which could subsequently provide a means of offering students personalized assistance. The current study presents the experience of students undertaking a GeoGebra-based mathematics+CT task with the assistance of ChatGPT. The data was collected and analyzed, including students' screen recording, students' interaction with ChatGPT, and the questionnaire. The findings indicate that a limited number of students were able to successfully construct objects on GeoGebra with the assistance of ChatGPT. Students were unable to provide a sufficiently detailed prompt to enable them to receive guidance. Nevertheless, the majority of students perceived ChatGPT as beneficial, although they felt that its responses required adaptation. This study highlights the importance of integrating and utilizing both ChatGPT and GeoGebra to enhance CT skills. Future research may examine the relationship between the expertise of using software or writing qualified prompts on ChatGPT and the effectiveness of responses.