{"type":"analysis","id":"analysis:ipo-makes-asynchronous-rl-drift-a-measurable-design-choice","slug":"ipo-makes-asynchronous-rl-drift-a-measurable-design-choice","title":"IPO makes asynchronous RL drift a measurable design choice","description":"Prime-RL’s IPO default pairs a probability-difference mask with diagnostics that expose trainer–inference mismatch. The useful shift is not a settled winner over ratio masking, but a reproducible way to test whether drift controls preserve learning on your workload.","published_at":"2026-10-20T18:00:00.000Z","updated_at":"2026-10-20T18:00:00.000Z","record_date":"2026-10-20","topics":["design"],"source_urls":["https://github.com/PrimeIntellect-ai/prime-rl/blob/main/docs/ipo.md"],"language":"en","routes":{"html":"https://newruntime.com/analysis/ipo-makes-asynchronous-rl-drift-a-measurable-design-choice/","markdown":"https://newruntime.com/analysis/ipo-makes-asynchronous-rl-drift-a-measurable-design-choice.md","json":"https://newruntime.com/analysis/ipo-makes-asynchronous-rl-drift-a-measurable-design-choice.json"},"author":{"role":"author","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"]},"editorial_provenance":{"desk":"authorial","target_ref":"story_cluster:prime-rl-ipo-loss-for-asynchronous-training-21c1500c3f47","authorial_article_id":"1d7bec92-cbdc-4482-86fc-51407bc365c4"},"next_reads":[{"type":"topic","path":"/topics/design/","url":"https://newruntime.com/topics/design/","title":"Design","reason":"Explore the design topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/design.md","json_url":"https://newruntime.com/topics/design.json"},{"type":"collection","path":"/analysis/","url":"https://newruntime.com/analysis/","title":"Analysis","reason":"Open the latest authorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/analysis.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"}]}