ChatGPT 5.5 Instant: OpenAI's New Default Model Explained

OpenAI is rolling out ChatGPT 5.5 Instant as the new default model for all users. This new model replaces 5.3 Instant and is now available to everyone. OpenAI says 5.5 Instant should produce fewer hallucinations and deliver better overall results for daily use. The company also claims it produced 52.5 percent fewer hallucinated claims in internal testing compared to 5.3. It also reduced inaccurate claims by over 37% in challenging conversations. What's interesting is that this update aims to make everyday interactions more useful and enjoyable. It promises stronger answers, a more natural conversational tone, and better use of shared context. The new model is also said to be better at using web search and analyzing image uploads. The bottom line: this new default model should make your interactions with ChatGPT more accurate and helpful.