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How accurately calibrated is Jev?

Jev is Poorly Calibrated

maximumeffort.substack.com

October 2, 2026

11 min read

🔥🔥🔥🔥🔥

43/100

Summary

Jev is TypeSafe’s new “System One” classifier model. The name is inspired by Daniel Kahneman’s book Thinking, Fast and Slow, in which he distinguishes between fast, instinctive, System One thinking and slower, conscious, System Two thinking.1 In this analogy, Large Language Models (LLMs) like Claude or GPT are System Two models and “Decision Models” like Jev and its predecessors (e.g. Laya) are Sy...

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