Anthropic holds the market edge at 56.5% implied probability due to its Claude Opus 5 and related models consistently ranking near the top of recent Text Arena math leaderboards, with strong scores in mathematical reasoning tasks driven by advanced chain-of-thought training and proprietary data. Google trails at 38.7% despite Gemini 4 Argon variants posting the highest single-model Elo in mid-October updates, reflecting trader emphasis on Anthropic's depth across multiple high-performing entries versus Google's narrower lead in preliminary votes. Other labs like Meta, OpenAI, and Chinese developers sit far lower as their models lag in head-to-head math arenas, with the tight 45-55% range for several underscoring uncertainty over final October snapshots amid rapid iteration cycles.