model-fingerprinting
Everything on Ground Truth tagged “model-fingerprinting” — 2 items.
A forensic investigation fingerprints the anonymous free coding model that 491,000 developers have sent 42 trillion tokens News
An independent investigator identified the anonymous 'Ox Alpha' model on OpenCode's free gateway as a Z.ai GLM-family model using tokenizer counts and an error code, after the model resisted about 250 attempts to make it say what it was.
ox-alpha identification harness Tool
A working, dependency-light harness for identifying an anonymous model endpoint: an interactive multi-turn CLI plus a parallel probe runner that logs every raw request and response. Its tokenizer-differential technique - comparing reported prompt-token counts for the same string across models - identifies a model family without needing the model to cooperate, and it runs against any OpenAI-compatible API.