OpenAI Ships GPT-5.4 Mini and Nano — Is It Worth Upgrading?
My First Encounter with GPT-5.4 Mini Left Me Speechless Last week, I was testing some code when my usual GPT-4 instance started acting weird. Instead of the usual response, I got something faster, more precise, and somehow more… aware. It turns out OpenAI had quietly rolled out GPT-5.4 Mini to select users, and I was…