GPT-5.5 Instant: smarter, clearer, and more personalized
OpenAI Blog
OpenAI updated ChatGPT's default model to GPT-5.5 Instant, which produces more accurate responses and fewer hallucinations. The model includes enhanced personalization controls that let users customize how ChatGPT behaves based on individual preferences. Users switching to this default model can expect more reliable answers and greater control over the system's output characteristics.
Why it matters
GPT-5.5 Instant updates ChatGPT’s default model with smarter, more accurate answers, reduced hallucinations, and improved personalization controls.