Accuracy of ChatGPT and DeepSeek in answering clinical questions from the 2025 Society for Cardiovascular Angiography & Interventions/Heart Rhythm Society left atrial appendage occlusion guidelines

ObjectiveTo evaluate the accuracy of ChatGPT and DeepSeek in answering guideline-based clinical questions in cardiology.MethodsIn August 2025, responses generated from four large language models to eight clinical questions based on the 2025 Society for Cardiovascular Angiography & Interventions/Heart Rhythm Society guidelines were evaluated. Three cardiologists independently rated accuracy using a six-point Likert scale: (a) completely incorrect; (b) more incorrect than correct; (c) nearly equally correct and incorrect; (d) more correct than incorrect; (e) nearly all correct; and (f) completely correct. Reproducibility (Fleiss' kappa coefficient, five repeated queries) and inter-rater reliability (intraclass correlation coefficient) were assessed.ResultsThe median (interquartile range) accuracy scores were 5.5 (5, 6) for ChatGPT-5, 6 (5, 6) for ChatGPT-4o, and 5 (4, 6) for both DeepSeek-R1 and DeepSeek-V3, with a significant overall difference (p < 0.001). Pairwise comparisons showed significantly higher accuracy for ChatGPT models than for DeepSeek models (all p < 0.001), whereas no significant differences were observed between ChatGPT-5 and ChatGPT-4o (p = 0.518) or between DeepSeek-R1 and DeepSeek-V3 (p = 0.812). Reproducibility (Fleiss' kappa coefficient) was excellent for ChatGPT-5 (0.803) and good for ChatGPT-4o (0.574), DeepSeek-R1 (0.577), and DeepSeek-V3 (0.618). Overall inter-rater reliability was moderate (intraclass correlation coefficient = 0.463).ConclusionsChatGPT and DeepSeek demonstrated high accuracy and reproducibility but moderate inter-rater reliability, necessitating further validation for educational use.