APIMaster.ai
Detect fake LLM APIs & reveal the real model underneath
What it does
The original idea was simple: I kept wondering – Is this LLM API I’m paying for actually real?? So I built something to answer that question. How does the detector work? I extracted 300+ stylistic features from each model (Opus 4.8 loves saying “genuinely”, “honestly”, and using “I” a lot, for example). Then built a classifier that can tell you what model is actually running behind the API. Based on 1k+ real user tests, 41% of LLM APIs out there are fake.
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