AI company Anthropic filed its S-1 form with the U.S. Securities and Exchange Commission (SEC) on Monday, disclosing its financial status to investors for the first time. Speculators on the prediction market platform Kalshi believe there is a 95% probability that the AI giant will officially announce an initial public offering (IPO) by the end of 2026. Meanwhile, traders on the Polymarket platform estimate a 69% probability that Anthropic will be listed on a public exchange by November 20.