Which company has the best Text Arena Math AI model end of August?

Traders currently price "Anthropic" at 94% for "Which company has the best Text Arena Math AI model end of August?". Over the past 24 hours that probability moved up 0.5 points. Full distribution: Anthropic 94%, Other 50%, Company A 50%, Company B 50%. The market has traded $87K in total volume and resolves Aug 31, 2026. Anthropic's Claude Opus 5 (max) and Claude Fable 5 currently lead Text Arena's math subcategory and overall text leaderboard with top Elo scores and strong performance on math benchmarks such as LiveBench Mathematics. Recent July releases and leaderboard updates have reinforced this edge in adaptive reasoning and complex problem-solving tasks, driving the 94% market-implied probability. OpenAI's GPT-5.6 family shows competitive results on select math evaluations like LiveBench, while Google's Gemini models trail slightly in Arena-specific math rankings. A late-August model update or benchmark shift from OpenAI or Google could narrow the gap before resolution, though Anthropic's demonstrated consistency across independent arenas makes such an overtake unlikely in the short window.

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