{"type":"post","id":"new-progress-index-v1-uses-item-response-theory-dcd58b","slug":"new-progress-index-v1-uses-item-response-theory-dcd58b","title":"New Progress Index v1 uses item response theory to compare models across years","description":"Artificial Analysis has launched Progress Index v1, a model-capability index intended to compare language models released years apart on one scale.","retrieval_nugget":"Artificial Analysis has launched Progress Index v1, a model-capability index intended to compare language models released years apart on one scale. It uses item response theory to jointly estimate model capability and task difficulty, addressing a limitation of benchmarks whose component evaluations change over time.","published_at":"2026-10-28","updated_at":"2026-10-28","record_date":"2026-10-28","date_kind":"published_at","topics":["models"],"entities":["Artificial Analysis","Progress Index v1","Intelligence Index","o3-mini","GPT-5.5","AA-LCR"],"related_patterns":[],"novelty_label":"new_fact","what_changed":"Artificial Analysis adds Progress Index v1, using item response theory to put models on a time-consistent capability scale; its existing Intelligence and Decision Indexes measure current or task-specific performance.","prior_refs":["memory:a00de2a5-36e4-8989-a962-75449505fed3","memory:a240c3bf-47ba-83a8-a523-7056f305f16a"],"source_url":"https://artificialanalysis.ai/methodology/progress-index","source_urls":["https://artificialanalysis.ai/methodology/progress-index"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:new-progress-index-v1-uses-item-response-theory-dcd58b","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/new-progress-index-v1-uses-item-response-theory-dcd58b/","markdown":"https://newruntime.com/posts/new-progress-index-v1-uses-item-response-theory-dcd58b.md","json":"https://newruntime.com/posts/new-progress-index-v1-uses-item-response-theory-dcd58b.json"},"challenged_patterns":["ai-engineering-evaluations-are-splitting-into-task-specific"],"next_reads":[{"type":"topic","path":"/topics/models/","url":"https://newruntime.com/topics/models/","title":"Models","reason":"Explore the models topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/models.md","json_url":"https://newruntime.com/topics/models.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"}]}