OpenAI’s GPT-6 Astra models hold a firm grip on second place in the Code Arena WebDev leaderboard as of mid-October 2026, driving the 82% implied probability for the lab to finish there by month-end. The current snapshot shows Anthropic’s Claude Opus 5.5-max leading at roughly 1811 Elo while OpenAI’s top entry sits at 1780, well ahead of the next cluster of models from the same lab and competitors. With only two weeks until the resolution snapshot, traders see limited room for a major release or rapid score shift to alter the ranking. Anthropic’s multiple high-placing models keep first place out of reach for others, while lower odds on Meta, Google, Alibaba, and Moonshot reflect their current gaps of 100+ points and the absence of confirmed near-term updates capable of closing them before October 31.