The updated default model of ChatGPT is now 50% less likely to provide misleading information regarding medical and financial inquiries.
GPT-5.5 Instant is now the default model for ChatGPT, promising notable reductions in hallucinations in areas such as medicine, law, and finance, along with shorter responses and improved personalization.
OpenAI has replaced GPT-5.3 Instant with GPT-5.5 Instant as the standard ChatGPT model, with the update being made available to all users starting today. The updated model aims to enhance three main aspects: accuracy, conciseness, and personalization.
Fewer hallucinations, less unnecessary content
According to OpenAI, the improvements in accuracy are particularly significant in critical subjects. Internal tests showed that GPT-5.5 Instant produced 52.5% fewer hallucinated claims compared to its predecessor on prompts related to medicine, law, and finance, and 37.3% fewer inaccurate claims on conversations that users had previously reported as erroneous.
GPT-5.5 Instant is being implemented in ChatGPT. This major upgrade offers you smarter, clearer, and more personalized responses in a friendlier, more natural tone. Additionally, it is more concise, responding in fewer words, which we noted you desired. We believe you will enjoy interacting with it.
The new model also demonstrates improved capabilities in photo analysis, STEM inquiries, and web search decisions. Responses are shorter and streamlined, with OpenAI stating that the new model utilizes 30.2% fewer words and 29.2% fewer lines than GPT-5.3 Instant.
Users will also find fewer unnecessary follow-up questions and enhancements in formatting.
Enhanced memory and user control
Furthermore, GPT-5.5 Instant is better at incorporating relevant context from past conversations, uploaded documents, and connected Gmail accounts to tailor responses without needing users to repeat information.
In conjunction with this, OpenAI is launching "memory sources" across all ChatGPT models. This new feature will inform users about the context that influenced a response, allowing them to delete or amend any part of it directly from settings.
The rollout of GPT-5.5 Instant will extend over the next two days to all ChatGPT users. GPT-5.3 Instant will remain accessible to paid users for three months through model configuration settings before being phased out. Enhanced personalization will initially be available to Plus and Pro users on the web, with Free, Go, Business, and Enterprise users to follow in the coming weeks.
Memory sources are being introduced across all ChatGPT consumer plans online, and OpenAI indicates that improvements in personalization and memory sources will soon be available on mobile as well.
Pranob is an experienced tech journalist with over eight years of experience in covering consumer technology. His writings have been…
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The updated default model of ChatGPT is now 50% less likely to provide misleading information regarding medical and financial inquiries.
OpenAI has updated the default model for ChatGPT from GPT-5.3 Instant to GPT-5.5 Instant, which claims to reduce hallucinated responses on medical, legal, and financial inquiries by 52.5%.
