Strong revenue momentum and pre-IPO investor enthusiasm are driving the 73.5% implied probability on an Anthropic IPO closing market cap above $1.8 trillion. The company reported Q3 2026 revenue of $16.8 billion, a 46% sequential jump, alongside adjusted profitability, during an October 14 investor day that highlighted its Claude large language model family, custom chip efforts, and AI safety positioning. This builds on a $965 billion May private valuation and a confidential S-1 filed in June, with roadshow marketing set for the week of November 9 and a potential listing before Thanksgiving. Traders appear to price in continued hypergrowth in the competitive frontier AI landscape, tempered by typical execution risks around compute commitments and market conditions for the November debut.