Anthropic’s closely bunched Polymarket odds around the $1.5–1.75 trillion and $500–750 billion ranges reflect uncertainty ahead of its planned mid-November IPO. Recent Q3 revenue of $16.8 billion showed 46% sequential growth, down from the prior period’s 145% pace, prompting investors at the October 14 presentation to discuss a roughly $1.5 trillion valuation versus earlier $2 trillion targets. The May 2026 Series H priced the company at $965 billion post-money on a $65 billion run-rate revenue base, while secondary marks hover near $1 trillion. Key near-term catalysts include the October 26 S-1 filing, November 9 roadshow, and final pricing that will set the end-November reference point amid competition from OpenAI and broader AI sector multiples.