Show HN: 178 AI Models Fingerprinted — 78% Writing Similarity Across Providers, 185x Price Gaps for Identical Output

Hacker News·medium signal

Rival.tips published research fingerprinting 178 AI models across 32 stylometric dimensions (lexical richness, sentence structure, punctuation, hedging patterns) and found clone clusters and cross-provider twins writing identically despite massive price differences — up to 185x cost for the same output style. The analysis uses cosine similarity on normalized 32-dimension vectors to identify models that may share training data or distillation lineage. Raises questions about whether consumers are paying for the brand rather than distinct capabilities.