Arize benchmark: Jev matches Claude Opus 5 on hallucination detection at 1/300 the cost
aparnadhinak · x · 2026-09-24
Arize AI compared Jev, Claude Opus 5, and GPT-5.6 Terra using 23,325 human judgments across accuracy, cost, latency, and calibration. Jev matched Claude Opus 5 at 87% hallucination-detection accuracy while running 23x faster at roughly 1/300 the cost.
The benchmark targets the LLM-as-a-Judge use case, suggesting small specialized decision models can approach frontier-LLM quality on evaluation tasks at a fraction of the price.
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