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Published by LangChain Blog (T1.5 source). The original is at https://www.langchain.com/blog/jev-is-now-available-in-langsmith-evals.

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The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

LangChain announces that Jev, a System One model, is now available as a judge in LangSmith Evals, offering a faster, cheaper way to score open-ended agent behavior and produce structured feedback across production runs, datasets, and regression tests.

Vendor walkthrough on wiring LLM-as-a-judge into agent evals, with the specific case for why code-based checks fail on non-deterministic agent outputs.

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