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TypeSafe's Jev Model Aims to Separate AI Decisions from Text Generation

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TypeSafe AI introduced Jev, its first System One model, in September 2026, designed to handle structured decisions rather than open-ended text generation. Unlike traditional large language models that return free-form strings requiring parsing, Jev outputs typed results such as choices, scores, and binary values directly consumable by application code. The model is intended to sit within an agent pipeline as a dedicated decision layer, evaluating actions like tool calls before they are executed. Developers retain control over thresholds, authorization logic, and side effects, meaning the application code — not the model — owns the final policy. The architecture is positioned as a way to reduce reliance on prompt engineering and output parsing for tasks that are fundamentally decision problems rather than generation problems.

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