Karan Singhal, a former Google researcher, now leads health research initiatives at OpenAI after joining the company in mid-2024. According to reports from Business Insider, Singhal's mission centers on making ChatGPT more accurate, useful and trusted by both patients and healthcare professionals. His approach emphasizes 'aggregating the wisdom of the crowd' through partnerships with more than 200 physicians and a dedicated team of health researchers.
Singhal's team has developed HealthBench, a framework designed to evaluate AI system performance on health-related tasks. As reported by Business Insider, OpenAI's latest free model, GPT-5.5 Instant, performed better than both physician-written responses and GPT-4o in company evaluations. The company recorded a 71% reduction in health-related responses flagged for inaccuracies over the past two months after analyzing billions of anonymized conversations.
To address the challenge of AI systems lacking personal medical history knowledge, OpenAI introduced a health-focused ChatGPT feature earlier this year that allows users to connect health applications and upload medical records. According to Business Insider, Singhal shared an example where the system analyzed his Apple Watch sleep data and suggested that bedroom temperature could be affecting deep sleep quality. This feature enables more personalized and accurate health guidance compared to traditional search engine results.
The healthcare transformation is gaining real-world validation through user success stories. As reported by Business Insider, Rathesh Prabakar, a 26-year-old senior software engineer in Bengaluru, successfully used ChatGPT throughout his compressed job search in late 2025. Prabakar handed in his notice at a billing company in October 2025 after working there since 2021, then accepted a new role at a product-based company in under a month. His notice period was unexpectedly shortened to approximately 15 days, compressing his search timeline. He enlisted ChatGPT to assist with resume tailoring, outreach drafting, and interview preparation, demonstrating how AI healthcare tools are becoming practical solutions for everyday users.
