OpenAI makes default ChatGPT more personal

OpenAI is making the default ChatGPT more accurate and more personal—changes that could increase people's reliance on it, while also increasing its access to their lives. OpenAI updated ChatGPT's default model to respond with more accuracy, more personalization and fewer gratuitous emoji. GPT-5.5 Instant is rolling out to all ChatGPT users and to the API. OpenAI says GPT-5.5 Instant produced 52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts in areas like medicine, law, and finance. It also reduced inaccurate claims by 37.3% in especially challenging conversations users had flagged for factual errors.