Listen: Ox Alpha is GLM
Prompt injection and gzip-NCD compression analysis reveal that OX Alpha, a mysterious LLM on OpenRouter, is GLM developed by Z.ai.
Transcript
A mysterious new AI model named OX Alpha recently appeared on the OpenRouter leaderboard, sparking rumors about its true identity. Some observers even guessed it might be a new Google Gemini model. But researchers set out to uncover the truth.
First, they used a prompt injection technique to trick the model. When they fed its own hidden system instructions back to it, the AI broke character. It admitted that it wasn't actually OX Alpha, but was instead GLM, a model created by Z.ai.
To confirm this confession, researchers used a clever text analysis method called Normalized Compression Distance. This technique compares how well different texts compress together. Because authors share distinct writing patterns, texts from the same model compress much more efficiently.
They tested OX Alpha's writing against responses from several top models. The results were clear. OX Alpha's style consistently matched GLM-5.3, easily beating out rivals like Claude and Gemini.
Between the model's own confession and the independent statistical analysis, the mystery is solved. OX Alpha is actually GLM-5.3 in disguise.