Anthropic leads trader sentiment at 60.5% implied probability for the best Text Arena math model by end of October, driven by its cluster of Claude variants—including recent Opus 5.5 and Fable 5.1 releases—securing multiple top ranks on the math-specific leaderboard with scores above 1510. These large language models demonstrate strong performance in community-voted benchmarks evaluating mathematical reasoning, outperforming OpenAI entries that sit near 2%. Google follows at 37.8% with its leading Gemini model, though fewer entries limit its edge. With resolution weeks away, upcoming model updates or leaderboard shifts from new capability demonstrations could still alter the aggregated trader consensus reflected in these real-money odds.