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No model will reach 1575 on the Math Arena Score by December 31, 2026. The Score column on the Text Arena | Math Leaderboard at arena.ai/leaderboard/text/math-no-style-control will show the shortfall. Anthropic’s Claude Opus 5 will have posted 84.4% on MathArena.ai in late July 2026 and OpenAI’s GP…