OpenAI Rolls Out GPT-5.5 Instant as Default ChatGPT Model
OpenAI released GPT-5.5 Instant as the new default model for ChatGPT, focused on reducing hallucinations in high-stakes domains like law, medicine, and finance. The update features advanced context management with the ability to reference past conversations and Gmail for personalized responses.
New Default Model Launched
OpenAI released GPT-5.5 Instant on May 5 as the new default model for ChatGPT, replacing GPT-5.3 Instant. The update focuses on reducing hallucinations in high-stakes domains such as law, medicine, and finance while maintaining low latency.
Enhanced Capabilities
The model adds advanced context management, using a search tool to reference past conversations, files, and Gmail for more personalized responses. It rolls out first to Plus and Pro users on the web, with mobile support coming soon and expansion to the free, business, and enterprise tiers in the coming weeks.
Performance Improvements
It builds on the broader GPT-5.5 release from last month, which boosted coding and knowledge work, scoring 81.2 on the AIME 2025 math test (up from 65.4) and 76 on the MMMU-Pro multimodal benchmark (up from 69.2).