OpenAI Launches GPT-5.5 Instant with 52.5% Lower Hallucination Rate
On May 5, OpenAI officially upgraded ChatGPT’s default model to GPT-5.5 Instant, replacing GPT-5.3 Instant. It focuses on higher accuracy, concise responses, and fewer unnecessary emojis. In high‑risk domains (medical, legal, financial), hallucinations dropped 52.5%; user‑marked factual errors fell 37.3%. Math & reasoning improved: AIME 2025 score rose from 65.4 to 81.2. Available to free & Plus users; paid users can revert for 3 months.
#OpenAI #GPT5.5 #ChatGPT
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