GPT-5.5 Instant brings frontier health intelligence to free ChatGPT users

GPT-5.5 Instant提升ChatGPT健康智能

OpenAI says GPT-5.5 Instant matches its priciest Thinking models on health benchmarks and is available to free users. In a blind review of 3,500 responses, physicians rated 5.5 Instant higher than human-written answers on accuracy, communication, and completeness, with fewer failure modes like missing red flags or failing to ask for context. Production monitors show a 71% drop in health-response factuality issues over two months. The improvements come from model advances and physician-led evaluations that define what good looks like in real-world health conversations.

Why it matters: OpenAI's official post on GPT-5.5 Instant health QA performance: 3,500 blind-rated responses scored higher than human doctors on accuracy, communication, and completeness, with a 71% drop in factual errors, available to free users. Concrete numbers and physician-led eval keep ...