Stylometry captures sentence length, Markdown usage, punctuation density, and list patterns. It is retained as a diagnostic because style can be useful for human inspection, but it is too easy to steer for scoring.
Algorithm
Compute response-level style features, average them across samples, and compare the vector with coarse stored centroids. Report the closest style family and the claimed model score as diagnostic context.
Thresholds
Condition
Verdict contribution
Closest style family matches claimed family
Diagnostic match
Closest style family differs
Diagnostic anomaly
Any result
Score contribution remains 0
Limitations
Style is highly prompt-dependent and can be changed by system prompts, decoding settings, or output rewriting. It is useful for explaining results, not for scoring them.
Anysingle signal cannot provemalicious behavior. Proxies may show anomalies for legitimate reasons (regional routing, A/B testing, degradation strategies, cache optimization).
Token ratio deviation may result from ChatML wrapping, system prompt injection, or tokenizer version differences — not necessarily intentional inflation.
Model identity judgment is based on statistical fingerprint matching, not cryptographic proof. Quantization, fine-tuning, and post-processing can all alter fingerprints.
MMD distribution tests are sensitive to temperature, sampling parameters, and system prompts. Significant p-values mean distributional difference, not proof of substitution.
Logprobs unavailability is increasingly common (many providers disable it by default in 2025-2026) and does not by itself indicate deception.
ITT rhythm fingerprinting is an early-stage technique. Network jitter, TCP coalescing, and gateway buffering can produce false signals.
This tool generates reference-grade evidence chains, not legal conclusions. Do not make definitive accusations based solely on this report.
The wording in the report refers to statistical "deviations" or "signal inconsistencies". Please do not use this to make fraud or deception claims against any service provider.