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Jev as a CoT Monitor: 6x Faster and 500x Cheaper!

Jev, a new model format that outputs certainties for predefined options, was tested against Claude Sonnet 5 and GPT-5.6 Luna for Chain of Thought (CoT) monitoring. Jev showed slightly better exact-match accuracy than Sonnet 5 but lower than GPT-5.6 Luna. It was significantly faster and cheaper, with a mean latency of 542 ms and a cost of $0.056 per 1,000 classifications.

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Tracking sinceSeptember 24, 202615 source points
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PublishedSeptember 23, 2026mahi-pas
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WHY IT MAY MATTER

Jev could be useful for applications requiring fast and cost-effective harm detection in reasoning processes, though it may not match the accuracy of other models in certain safety levels.

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