{"type":"post","id":"open-source-lm-fingerpoint-detector-identifies-which-llm-369327","slug":"open-source-lm-fingerpoint-detector-identifies-which-llm-369327","title":"Open-source LM Fingerpoint Detector identifies which LLM sits behind an API from its 'random number' distribution","description":"Ikaleio has released LM Fingerpoint Detector, an open-source utility that estimates which language model may sit behind an API endpoint by comparing its numerical-response distribution with a reference bank.","retrieval_nugget":"Ikaleio has released LM Fingerpoint Detector, an open-source utility that estimates which language model may sit behind an API endpoint by comparing its numerical-response distribution with a reference bank. For teams buying or routing inference through intermediaries, it offers a repeatable sanity check—but not proof of a model’s identity.","published_at":"2026-10-29","updated_at":"2026-10-29","record_date":"2026-10-29","date_kind":"published_at","topics":["anthropic"],"entities":["Ikaleio","LM Fingerpoint Detector","lmfpd","OpenAI Responses API","OpenAI Chat Completions API","Anthropic Messages API"],"related_patterns":[],"novelty_label":"new_fact","what_changed":"Introduces a tool that fingerprints which LLM serves an API by its random-number distribution; the prior covers testing free LLM API offerings, not model identification.","prior_refs":["memory:a00dee3b-a3ac-8c25-a4ff-4c26ac76adbd"],"source_url":"https://github.com/Ikaleio/lm-detector","source_urls":["https://github.com/Ikaleio/lm-detector"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:open-source-lm-fingerpoint-detector-identifies-which-llm-369327","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/open-source-lm-fingerpoint-detector-identifies-which-llm-369327/","markdown":"https://newruntime.com/posts/open-source-lm-fingerpoint-detector-identifies-which-llm-369327.md","json":"https://newruntime.com/posts/open-source-lm-fingerpoint-detector-identifies-which-llm-369327.json"},"next_reads":[{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}