American Heart Association Hypertension Scientific Sessions 2026 – Moderated Poster #TH125 - Three of the top four popular artificial intelligence (AI) tools – OpenAI’s ChatGPT, Microsoft’s Copilot and Perplexity AI – could not consistently identify if a home blood pressure monitor had passed clinical validation testing, with accuracy only 63% to 83% of the time. Google Gemini performed better but still provided incorrect responses about 10% to 15% of the time.