AI API Provider Detection Rankings

APIMaster extracts 300+ stylistic fingerprint features from each model — for example, Opus 4.8 tends to use "genuinely", "honestly", and frequently says "I" — to identify which model is actually running behind an API. All rankings come from real user detections, covering GPT 5.4, GPT 5.5, Deepseek-v4-flash, Deepseek-v4-pro, Sonnet 4.6, Opus 4.7, Opus 4.8. Compare pass rates, latency, and model substitution risk — find cheaper OpenRouter alternatives.

AI models may exhibit hallucination and drift. Detection results are not 100% accurate — please rely on multiple detection results for a reliable assessment.