Building with OpenAI GPT-5.5 Instant: What Changed
Building with OpenAI GPT-5.5 Instant: What Changed TL;DR: GPT-5.5 Instant replaces GPT-5.3 Instant as ChatGPT’s default model on May 5, 2026 52.5% reduction in hallucinated claims on high-stakes prompts (medicine, law, finance) Tighter responses with reduced verbosity, fewer emojis, and less overformatting Enhanced personalization for Plus/Pro users via past chats, files, and Gmail context Memory … Read more