Claude Opus 5.5 Takes #1 on the LLM Arena

Top 7 | Tech, AI & Crypto Analytics (@top7ico), Sep 24, 2026, 10:12 UTC

Claude Opus 5.5 Takes #1 on the LLM Arena Anthropic's Claude Opus 5.5, released this week, debuts at the top of the Arena leaderboard with a score of 1,818. It's 26 points ahead of OpenAI's GPT-6 Astra (1,792) and 63 ahead of Anthropic's own Fable 5.1 (1,755). Anthropic now holds four of the top ten spots, and OpenAI holds two. The chasing pack is tight: from GPT-6 Sol at #5 (1,686) down to Meta's Muse Spark 1.3 at #10 (1,658), six models sit within 28 points of each other. Two Chinese labs are in that group, Alibaba with Qwen3.8-Max (1,671) and Moonshot with Kimi K3 (1,660). Only three mod…

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