Anthropic leads Code Arena WebDev market-implied odds at 78% because its recent Claude releases, including Fable 5.2 and Opus 5.5 variants, have secured the top leaderboard positions through superior performance on interactive web app generation and front-end tasks as of mid-November 2026. Multiple Anthropic large language models occupy the highest Elo-style scores on community-voted benchmarks, reflecting strong capabilities in agentic coding, React integration, and multi-step reasoning that outpace rivals. OpenAI trails at 12% with competitive full-stack results from GPT-6 models, while Google, Meta, and others sit lower amid narrower specialization. Traders appear to view Anthropic’s iteration pace and benchmark consistency as durable through December, though new model drops or benchmark revisions could narrow the gap.