GPT-5.5 Instant: Less Hallucination, New Default ChatGPT

ChatGPT just got a major upgrade for everyone. OpenAI has replaced the old model with GPT-5.5 Instant as the new default, and it promises to hallucinate much less. Here's the thing: OpenAI claims a 52.5% reduction in made-up statements across critical areas like medicine, law, and finance. This is huge for anyone who uses ChatGPT and worries about accuracy. The new model also produces 37.3% fewer inaccurate responses in long, complex conversations. Plus, answers are now shorter, cutting out unnecessary padding. What's interesting is a new feature called "Memory Sources." ChatGPT will now show you which past chats or files influenced its responses, and you can even delete these sources. This transparency is a big step. The bottom line: Your ChatGPT experience should now be more reliable and trustworthy, especially for quick research.