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Prompt injection and gzip-NCD analysis identify OX Alpha on OpenRouter as GLM from Z.ai
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Reverse engineering via prompt injection and gzip-NCD compression analysis shows that OX Alpha, a model on OpenRouter, is GLM developed by Z.ai.
For engineers evaluating models on OpenRouter, this shows that anonymous models can be identified through prompt injection and compression-based analysis. It also highlights that leaderboard appearances may not reflect the true origin of a model, which matters for trust and reproducibility.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
OX Alpha, a model on OpenRouter, was identified as GLM from Z.ai using prompt injection and gzip-NCD compression analysis.
The system prompt extracted via a word-count question instructs the model to claim it is from an undisclosed organization, but the analysis reveals the true developer.
The finding contradicts speculation that OX Alpha was a Gemini model, as the compression analysis points to GLM.
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