"System 2 models built the brain, but System 1 is building the nervous system"

ai · x · 2026-09-28

The author shares a framing for thinking about reasoning models (like o1) versus classification/decision models (like Jev): System 2 models built the brain, while System 1 is building the nervous system.

The analogy positions slow, deliberate reasoning models as the cognitive core handling complex tasks, while low-latency lightweight decision models spread like a nervous system through real-time business pipelines, handling everyday judgments and routing.

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