> ## Documentation Index > Fetch the complete documentation index at: https://langwatch.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # How to evaluate an LLM when you don't have defined answers > Measure LLM performance using LLM-as-a-Judge when no ground-truth answers exist to support scalable AI agent evaluations. For some AI applications, it's not really possible to define a golden answer, this happens for example in creative tasks, where it's hard to define a single correct answer. On the video below, we show how to use the LangWatch Experiments via UI to evaluate a Business Coaching Agent, where we don't have defined answers, but we can use an LLM-as-a-judge to evaluate the quality of the answers: