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Sep 29, 2026 · Artificial Intelligence

Reverse-Engineering Jev: 10K API Calls Expose Closed-Source Model Architecture

An independent researcher reverse-engineered TypeSafe's closed-source Jev classification model using 10,000 API calls, revealing its architecture uses a classification head with shared prefix inference, listwise scoring, and exceptional calibration (ECE 0.0313), challenging assumptions about black-box security.