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Show HN: We fingerprinted 178 AI models' writing styles and similarity clusters

https://rival.tips/research/model-similarity

We have a dataset of 3,095 standardized AI responses across 43 prompts. From each response, we extract a 32-dimension stylometric fingerprint (lexical richness, sentence structure, punctuation habits, formatting patterns, discourse markers).Some findings:- 9 clone clusters (>90% cosine similarity on z-normalized feature vectors) - Mistral Large 2 and Large 3 2512 score 84.8% on a composite...

( Read More... | 23 comments | 57 points | on HN )
Re: on Saturday March 14, 2026 @12:39PM (#47378421)
We analyzed 7,877 responses from 250 models (same prompts, controlled conditions) and found interesting patterns that don't show up in standard benchmarks.

→ Name hallucination convergence: "Professor Chen" appears 279 times across unrelated creative writing prompts. 19/250 models independently chose "Sir Reginald" for a knight character.

→ Provider fingerprinting via punctuation: Claude averages 5.90 em dashes per 1K words. Gemini: 9.18 exclamation marks. Mistral: 3.48 emoji. Distinct enough for classification.

→ Cultural reference bias: 59:1 Western to non-Western ratio. 1,069 Western references vs 18 non-Western across the full corpus.

→ Humor convergence: 42% of models open with the identical atom joke. Format convergence is total: 100% produce setup-punchline one-liners. Zero attempt observational comedy.

→ Visual generation defaults: "Draw a surprise animal" produces a fox 40% of the time (DeepSeek: 67%, Llama: 0%).

Full writeup in the link (the complete research is gated)

Re: on Tuesday October 07, 2025 @12:56PM (#45505621)
Finished testing gpt 5 pro, the difference in quality to any other SOTA is minimal, yet the time to respond and cost are sky high.

I'm still waiting for a generational leap that would freaking change the field. After testing 121 AI models I can tell most give the same boring responses to a certain degree:

- All models do the pelican SVG challenge with the exact same POV - All models give "5 unique jokes" that are extremely similar - Models from different providers give similar responses to creative open-ended questions

Show HN: Rival – Open-source tool for visually comparing AI model responses

https://www.rival.tips/

I built RIVAL to see how different AI models respond to the exact same one-shot prompt, side-by-side in a visual way. It lets you compare one-shot responses from models like GPT-4.5, Claude Sonnet 3.7, Grok 3, and others across different challenge types (coding, web design, SVG generation, text analysis). Features: - Interactive visual comparisons with expandable cards - Focus on the actual...

( Read More... | no comments | on HN )
Re: on Tuesday December 03, 2024 @06:48PM (#42313005)
A bit of a different - experimental - tool I've built for macOS. This one helps you ponder decisions among 2-3 options over several factors of different weights to arrive at a logical conclusion. I'm in the process of building 26 open-source macOS apps, one for each letter of the alphabet.