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I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up

calendar_today May 13, 2026 person Nick Lucchesi domain the-new-stack

Last week, OpenAI replaced GPT-5.3 Instant as ChatGPT’s default model with GPT-5.5 Instant, rolling it out to all users for The post I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up appeared first on The New Stack .

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I tested OpenAI’s three claims about GPT-5.5 Instant, and only one fully held up