Anthropic, the AI research company behind Claude, has emerged as one of the most valuable private AI startups. Founded in 2021 by former OpenAI researchers, the company has raised funding at valuations approaching $20 billion as of early 2024. This market question asks whether Anthropic's public market capitalization will reach or exceed $600 billion on its IPO day by December 31, 2027. Resolvability depends on Anthropic completing its initial public offering and the company's first-day closing market cap being measured against the $600 billion threshold. Current trading shows 83% odds assigned to YES, suggesting market participants expect strong post-IPO demand for an AI leadership company. This pricing reflects confidence in the AI sector's growth trajectory and Anthropic's competitive position against rivals like OpenAI and Google's AI divisions. The high odds indicate sustained market conviction that Anthropic will achieve flagship status in public markets. For historical context, few non-mega-cap tech companies have opened above $600 billion valuations, making this outcome ambitious yet plausible given the current AI boom and Anthropic's track record in large language models.