Anthropic, one of the world's leading artificial intelligence research companies, is planning its initial public offering. This market tracks whether Anthropic's market capitalization will fall between $400 billion and $600 billion at the closing price on its IPO day, currently expected around June 30, 2026. The question is resolvable through Nasdaq-listed stock prices and publicly available market data from the company's IPO filing. At just 2% YES odds, the market implies that traders see the probability of Anthropic landing in this mid-to-high valuation range as very unlikely. This suggests market participants either expect Anthropic's IPO valuation to fall significantly below $400 billion, exceed $600 billion, or remain privately held past the June deadline. Recent comparable IPOs of other AI-focused technology companies, venture capital investment rounds, and competitive positioning within the generative AI sector will all influence final IPO pricing. The trading activity reflects strong interest in IPO timing and valuation predictions among market participants. As the IPO date approaches, the odds trajectory will likely shift significantly based on economic conditions, company announcements, and emerging information about Anthropic's financials, revenue, and market positioning relative to competitors.