Anthropic, the AI safety company founded by former OpenAI researchers, has not yet filed for IPO but market participants are pricing in a potential public offering by December 2027. This prediction market focuses on a specific valuation scenario: whether the company's market capitalization at IPO close will fall between $100 billion and $200 billion. At 1% YES odds, traders are pricing this outcome as extremely unlikely, indicating expectations of either a higher or lower valuation at IPO. The broad $100B range represents a meaningful band—Anthropic could debut below $100B if AI competition intensifies, or above $200B if Claude maintains strong market positioning. The market currently shows modest liquidity at $9,175 in total depth, with low 24-hour volume of $320, suggesting limited active trading on this specific valuation band. If Anthropic completes an IPO before the December 31, 2027 deadline, resolution becomes straightforward: confirm the official IPO closing price from SEC filings, calculate fully diluted shares outstanding, and verify whether the resulting market cap falls within the specified range. Current price action suggests the broader market expects outcomes outside this band, either substantially lower or higher.