GPT-5.5 Instant: smarter, clearer, and more personalized
Summary
OpenAI has released GPT-5.5 Instant, an updated version of ChatGPT's default model that aims to provide smarter, more accurate answers with clearer language and better personalization based on your conversation history. The new model produces 52.5% fewer hallucinated claims (false or made-up statements) compared to the previous version on high-stakes topics like medicine and law, and includes a new 'memory sources' feature that shows you what past context was used to personalize your responses, giving you control to edit or delete outdated information.
Solution / Mitigation
The source mentions the following controls and mitigations for personalization concerns: Users can delete chats they no longer want cited, delete or change items in saved memories through settings, or use temporary chats that don't use or update memory. When a response is personalized, users can see what context was used in 'memory sources' and delete or correct outdated information. Memory sources are not shown to others if you share a chat. The source also notes that 'memory sources are designed to make personalization easier to understand' and OpenAI plans to make this feature 'more comprehensive over time.'
Classification
Affected Vendors
Related Issues
Original source: https://openai.com/index/gpt-5-5-instant
First tracked: May 5, 2026 at 02:00 PM
Classified by LLM (prompt v3) · confidence: 95%