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OpenAI makes GPT-5.5 Instant default with fewer errors, memory

OpenAI has replaced GPT-4o with GPT-5.5 Instant as the default model in ChatGPT, claiming a 52.5% reduction in hallucinations on sensitive topics and expanded cross-session memory. The update affects ...

OpenAI's updated GPT-5.5 Instant is better at shopping, complex constraints, and understanding user intent — and it's already in the API

OpenAI is moving away from models that require heavy hand-holding and toward systems that can better infer the user’s goal, ...
VentureBeat

GPT-5.5 Instant shows you what it remembered — just not all of it

OpenAI updated the default model for ChatGPT to its new GPT-5.5 Instant, along with a new memory capability that finally shows which context shaped responses — at least some of them. This limitation ...