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OpenAI Rolls Out GPT-5.5 Instant as New Default Model for ChatGPT
OpenAI has begun rolling out GPT-5.5 Instant to all ChatGPT users over the next few days, delivering smarter reasoning, significantly fewer hallucinations, clearer and more concise responses, and a warmer, more natural tone. The upgrade focuses on factuality, crushing hacks, and baseline intelligence improvements. Michelle Pokrass from OpenAI called it a 'pretty big step forward.'
Why it matters
This major upgrade to the most widely used AI chatbot enhances everyday productivity and reliability, pressuring rivals like Claude to accelerate their releases.