Ethan Mollick: transformer is less than a decade old, first Reasoner not yet two

emollick · x · 2026-09-07

Ethan Mollick puts AI progress in perspective: the transformer architecture is less than a decade old, GPT-3.5 (ChatGPT) shipped under four years ago, and the first Reasoner model (o1-preview) is not yet two years old — highlighting how quickly each major capability jump has arrived.

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