The article evaluates the performance of the ChatGPT-4o large language model in risk of bias assessments using Cochrane's RoB 2.0 tool. The study found that ChatGPT-4o had slight agreement in the overall assessment and varied agreement rates in different bias domains. The results suggest that ChatGPT-4o may not be suitable for risk of bias assessments with simple prompts, highlighting the need for further research on improving its performance.