GPT-5.5 Instant: OpenAI updates ChatGPT’s default model to reduce hallucinations
OpenAI has released GPT-5.5 Instant as the new default model for ChatGPT, replacing GPT-5.3 Instant for all users. The company says the update focuses on three areas: fewer factual errors, more concise responses, and better personalization. According to OpenAI, internal evaluations show that GPT-5.5 Instant produced 52.5% fewer hallucinated claims than GPT-5.3 Instant on sensitive …