{"type":"post","id":"gpt-6-1-sol-max-slips-to-fifth-c0c585","slug":"gpt-6-1-sol-max-slips-to-fifth-c0c585","title":"GPT-6.1 Sol (Max) slips to fifth on Agent Arena as Claude Opus 5.5 (Max) leads the Oct 23 update","description":"Summary Agent Arena’s Oct. 28 leaderboard puts Claude Opus 5.5 Max first among the listed agent models with a reported 20.94 net improvement at a median 7.06 per task. GPT-6.1 Sol Max is sixth at 12.47 and 0.90 per task.","retrieval_nugget":"Agent Arena’s Oct. 28 leaderboard puts Claude Opus 5.5 (Max) first among the listed agent models, with a reported 20.94% net improvement at a median $7.06 per task. GPT-6.1 Sol (Max) is sixth at 12.47% and $0.90 per task. For AI builders, the useful signal is the changing performance-cost frontier, not a single rank.","published_at":"2026-10-28","updated_at":"2026-10-28","record_date":"2026-10-28","date_kind":"published_at","topics":["claude","gemini","anthropic"],"entities":["Agent Arena","Claude Opus 5.5","Claude Sonnet 5.5","Claude Fable 5.1","GPT-6.1 Sol","GPT-6 Astra","Gemini 4 Carbon","Anthropic"],"related_patterns":["agent-economics-moves-to-completed-work"],"novelty_label":"new_fact","what_changed":"The Oct. 28 leaderboard update places GPT-6.1 Sol (Max) sixth at +12.47% and $0.90/task, behind Claude Opus 5.5 and Gemini 4 Carbon; it was #2 in the Oct. 13 snapshot.","prior_refs":["memory:4f3f387f-4661-8ae1-a314-23151e8c2b07","memory:ce50f3e9-49eb-8de4-a55f-b94de829e0cc","memory:2c48707a-a4a0-82d5-aa75-2acb43023185"],"source_url":"https://arena.ai/leaderboard/agent/pareto","source_urls":["https://arena.ai/leaderboard/agent/pareto"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:gpt-6-1-sol-max-slips-to-fifth-c0c585","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/gpt-6-1-sol-max-slips-to-fifth-c0c585/","markdown":"https://newruntime.com/posts/gpt-6-1-sol-max-slips-to-fifth-c0c585.md","json":"https://newruntime.com/posts/gpt-6-1-sol-max-slips-to-fifth-c0c585.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":"topic","path":"/topics/gemini/","url":"https://newruntime.com/topics/gemini/","title":"Gemini","reason":"Explore the gemini topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/gemini.md","json_url":"https://newruntime.com/topics/gemini.json"},{"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"}]}