GPT-5.5 Instant: ChatGPT's New Default Model

OpenAI has officially launched GPT-5.5 Instant, making it the new default model for all ChatGPT users. This update replaces the previous GPT-5.3. What's interesting is the significant improvement in factual reliability. The new model boasts 52.5% fewer "hallucinations" in critical areas like medicine and law. It also features enhanced personalization through new "Memory Sources." Users can expect a more natural and concise conversational tone. The new model also shows superior performance in math, science, and visual reasoning. This update means a more reliable and personalized experience for everyone using ChatGPT.