Why does the model I use for evaluation prefer the model it came from?
机会
LLM-as-judge has become the default way to run quality evaluations at scale, but judges from the same model family rate their own outputs 10 to 25 percent higher than equivalent outputs from a different family. Multiple 2025 and 2026 papers confirm the bias holds across position, verbosity, and rubric-constrained formats, and simple mitigations like panel voting reduce but do not eliminate it. Existing measurement frameworks cannot separate genuine quality differences from stylistic self-matching, so the effect cannot be corrected without first being cleanly isolated. Any team using the incumbent model to evaluate a replacement is running an evaluation with a structural thumb on the scale.
为什么重要
The entire AI improvement loop depends on honest quality signals, and a biased evaluator corrupts that signal at the source without raising any alert.
我如何评估机会
机会评分是我的个人判断，而非量化指标：痛苦程度、发生频率，以及当前解决方案的匮乏程度。分数越高，意味着我认为越值得去构建。
出现时造成的痛苦程度。
人们实际遇到它的频率。
当前针对它的优质工具有多匮乏。