Delip Rao: CoT was 'System 2', now LLMs are — nobody knows what System 2 means

deliprao · x · 2026-09-17

Former Meta AI scientist Delip Rao notes that CoT was once branded as "System 2" and current LLMs are now given the same label, arguing that nobody — including himself — really knows what System 1 or 2 means, and that fancy terminology is a surefire way to farm X engagement.

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