Anthropic's implied IPO probability on Polymarket has fallen sharply, according to monitoring by PPP's prediction-market tool. The market now puts the chance of Anthropic listing by Oct. 31, 2026, at 5%, down 50% over the past week, while the probability of a listing by Nov. 15, 2026, stands at 27%, down 41% in one week. Under the market's settlement rules, the outcome is Yes only if Anthropic is formally listed on a public securities exchange and its shares are available for trading by 11:59 p.m. Eastern Time on the specified date. If Anthropic is acquired by a publicly listed company, the market settles immediately as No. Anthropic's official disclosures and documents issued by the relevant stock exchange are the primary sources for settlement. PPP also invited readers to join its signal-alert community and provided the original Polymarket link.