AI BriefingGPT-5.5 Instant: Smarter, Clearer, and More Personalized Answers
Key point
OpenAI has updated ChatGPT's default model to GPT-5.5 Instant, improving accuracy and personalization.
Details
ChatGPT's default model, GPT-5.5 Instant, has been improved to give smarter, more accurate, and shorter, clearer answers. Its conversational tone has also become more natural, and it now makes better use of context users have already shared to produce personalized responses.
The biggest change is in factuality. In internal evaluations, GPT-5.5 Instant showed a 52.5% reduction in false claims compared to GPT-5.3 Instant on high-stakes prompts where accuracy matters, such as medicine, law, and finance, and a 37.3% reduction in inaccurate claims in difficult conversations where users pointed out errors.
Its general versatility has also expanded.
- Analyzing uploaded photos and images
- Answering STEM questions
- Deciding whether to use web search for more helpful answers
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