Frontend AI Walk

Sep 21, 2026 · Artificial Intelligence

JEV and System 1/2: Why AI Engineering Needs Fast/Slow Model Split

The article argues that current AI systems overuse powerful but slow System 2 models for all tasks, proposing a Kahneman-inspired System 1/2 layered architecture where fast, cheap models handle 80-90% of routine decisions while System 2 tackles complex reasoning, reducing cost 80% and latency from seconds to milliseconds.