OpenAI Full Rollout of GPT-5.5 Instant: Replacing 5.3 as Default Model, Introducing Memory Recall Feature

According to Dynamic Insight monitoring, OpenAI has released GPT-5.5 Instant, a major upgrade to the default model of ChatGPT, now available to all users. GPT-5.5 Instant brings comprehensive improvements in intelligence, fact accuracy, and response quality. Key enhancements include a significant increase in fact accuracy, with a 52.5% reduction in hallucinations in high-risk areas such as medicine, law, and finance, and an overall decrease of 37.3% in inaccurate statements. Additionally, the model has been enhanced in STEM questions, image analysis, tool utilization (such as web search), and visual reasoning. The response style has also been optimized—answers are more concise (with a reduction of approximately 30% in word count), reducing redundant formatting, excessive emojis, and unnecessary follow-up questions, maintaining a warm personality while avoiding clutter.

The new model excels in personalization, intelligently leveraging chat history, uploaded files, and connected Gmail contexts to provide highly tailored suggestions and plans, all while ensuring users retain full control. GPT-5.5 Instant exhibits a more naturally practical tone in everyday conversations, offering succinct and practical workplace advice or personalized recommendations based on user preferences (such as tea shop choices). OpenAI emphasizes that as Instant serves as a "daily driver" assistant for most people, these minor yet comprehensive improvements significantly enhance the user experience, making ChatGPT a more reliable and efficient AI partner.