I’ve been trying to figure out the true lineage of openrouter/pony-alpha , so I decided to run it through a tool I just found called RepTrace . It was published as “LLM DNA: Tracing Model Evolution via Functional Representations” (ICLR 2026 Oral). The tool flagged a 37% functional similarity to z-ai/glm-4.7 , which is significantly higher than the next closest matches (Gemini 3 Flash at 22% and Grok 4.1 at 19%). Screenshot of the demo I found the demo at dna.xtra.science and the code is up on GitHub/PyPI for those interested. This fingerprinting approach seems really promising for verifying model ancestry or detecting contamination in “proprietary” models without needing weight access. I wonder if this concept could eventually be extended to fingerprint multimodal models or more interesting applications? submitted by /u/Opposite_Albatross_1
Originally posted by u/Opposite_Albatross_1 on r/ArtificialInteligence