OpenAI Unveils GPT-5.5 Instant as New Default Model for ChatGPT

OpenAI announces the launch of GPT-5.5 Instant, positioning it as the latest language model in its portfolio. OpenAI's research team says the model incorporates recent advances in scaling and efficiency. The company states the model will serve as the new default engine powering ChatGPT, replacing previous versions and aiming to improve response speed and relevance.

GPT-5.5 Instant is described as an instant‑response model designed for real‑time conversational use. It will handle user queries across the ChatGPT interface, offering the same conversational abilities as earlier models but with optimized latency. OpenAI highlights its role as the standard model for all users.

ChatGPT users will experience the new default model automatically, without needing to select a version. The rollout means that every interaction on the platform will be processed by GPT-5.5 Instant, reflecting OpenAI’s commitment to continuously upgrade its AI services.