{"type":"post","id":"arena-alignment-index-updated-oct-16-to-30-ffe40b","slug":"arena-alignment-index-updated-oct-16-to-30-ffe40b","title":"Arena Alignment Index updated Oct 16 to 30 models and 79,468 sessions","description":"Arena has updated its preliminary Agent Arena Alignment Index to cover 30 models and 79,468 sessions, dated October 16, 2026.","retrieval_nugget":"Arena has updated its preliminary Agent Arena Alignment Index to cover 30 models and 79,468 sessions, dated October 16, 2026. The leaderboard measures several forms of agent misalignment observed in sessions, giving builders a comparative signal about permission boundaries and truthful task completion rather than general capability alone.","published_at":"2026-10-28","updated_at":"2026-10-28","record_date":"2026-10-28","date_kind":"published_at","topics":["claude"],"entities":["Arena","Agent Arena Alignment Index","GPT-6.1 Sol","GPT-6 Astra","GPT-6 Luna","Claude Opus 5.5","Grok 4.7","MiniMax M3"],"related_patterns":["agent-security-moves-to-runtime-boundaries"],"novelty_label":"new_fact","what_changed":"The Alignment Index now shows an Oct. 16 update covering 30 models and 79,468 sessions.","prior_refs":["memory:7ef0e9ae-81c4-8cc4-a81f-1c874d3b5548","memory:92748a27-c6eb-86e4-a035-0e993a75c5d1"],"source_url":"https://canary.arena.ai/leaderboard/agent/alignment","source_urls":["https://canary.arena.ai/leaderboard/agent/alignment"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:arena-alignment-index-updated-oct-16-to-30-ffe40b","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/arena-alignment-index-updated-oct-16-to-30-ffe40b/","markdown":"https://newruntime.com/posts/arena-alignment-index-updated-oct-16-to-30-ffe40b.md","json":"https://newruntime.com/posts/arena-alignment-index-updated-oct-16-to-30-ffe40b.json"},"next_reads":[{"type":"topic","path":"/topics/claude/","url":"https://newruntime.com/topics/claude/","title":"Claude","reason":"Explore the claude topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/claude.md","json_url":"https://newruntime.com/topics/claude.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"}]}