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OpenAI will not have the highest arena rank on the Chatbot Arena LLM Leaderboard's Rank column under the Text Arena | Overall tab with style control off by December 31, 2026. Anthropic's Claude Opus 5, Fable 5 and Mythos 5 led most LLM leaderboards as of August 2026, and xAI's Grok 4.6 refresh in m…