# LangChain reports Jev matched a human reviewer vs GPT-5.6 and Claude Sonnet 4.6 as agent-eval judges

LangChain said it tested Jev against GPT-5.6 Luna, GPT-5.6 Terra, and Claude Sonnet 4.6 as agent-eval judges, reporting a human-reviewer match on every call, up to 913x lower variance, 0.44s per call, and a $0.34 full-run cost versus $28.17 with Claude Sonnet 4.6.

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Source: LangChain · Published 9/21/2026, 10:13:27

LangChain said it tested **Jev** against **GPT-5.6 Luna**, **GPT-5.6 Terra**, and **Claude Sonnet 4.6** as agent-eval judges.

According to LangChain, Jev matched a human reviewer on every call, with up to **913x lower variance**, at **0.44s per call** versus **2.16-2.83s** for the LLMs. It reported the cost of the full run as **$0.34** with Jev and **$28.17** with Claude Sonnet 4.6.

Tags: LangChain, Jev, Evaluation, GPT-5.6, Claude Sonnet 4.6

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