[How to define an LLM-as-a-judge evaluator | 🦜️🛠️ LangSmith](https://docs.smith.langchain.com/evaluation/how_to_guides/llm_as_judge): LLM should read this page when implementing LLM-as-a-judge evaluators, setting up evaluation systems for conversational AI, or creating custom evaluators for language models. The page explains how to define an LLM-as-a-judge evaluator using the LangSmith SDK, including custom evaluator implementation with code examples that use OpenAI GPT models to evaluate the consistency of reasoning in AI-generated responses.

