Anthropic holds the strongest market-implied position at 63% for topping LiveBench Mathematics by end of November, driven by its recent Claude Opus 4.8, Opus 5.5, and Fable 5 releases posting leading scores on contamination-resistant math benchmarks such as USAMO 2026, FrontierMath v2, and ProofBench. These models excel at multi-step quantitative reasoning and olympiad-level problem solving compared with OpenAI’s GPT-5 and o-series entries, which dominate broader LiveBench aggregates but trail in specialized math categories. Google’s Gemini 3.1 and other labs remain further behind on the latest verified evaluations. Traders are pricing in limited upside for challengers before the November snapshot, though any major model update or benchmark refresh could still alter the leaderboard.