Trader consensus on Anthropic’s IPO closing market cap exceeding $1.8 trillion at 75.5% implied probability stems from its confidential S-1 filing and leaked prospectus detailing explosive revenue growth to a $65 billion annualized run rate by mid-2026 alongside aggressive expansion of its Claude large language models. Recent launches of the Claude 5.5 family, enterprise partnerships, and positioning against OpenAI have reinforced expectations for a $1.8–2 trillion-plus debut targeted for mid-November 2026 on Nasdaq. Private-market marks near $1.39 trillion and investor projections for sustained AI demand support the leading outcome, though heavy compute commitments and operating losses introduce uncertainty around final pricing and post-IPO performance.