AI giant Anthropic said on Monday it has confidentially filed for a U.S. initial public offering, teeing up what could become a watershed moment for Wall Street's AI frenzy.

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The move sets up a high-stakes test of whether investor appetite for the AI revolution can match the sky-high expectations surrounding the booming sector. Anthropic, which operates the AI chatbot Claude, did not disclose the size or terms of the offering.

Anthropic last raised $65 billion at a post-money valuation of $965 billion in late May, putting it ahead of rival OpenAI. The company's valuation has more than doubled from $380 billion in February, when it raised $30 billion. The listing follows SpaceX's mega-IPO, which is pursuing a $75 billion offering at a $1.75 trillion valuation.

OpenAI is also preparing to confidentially file for a U.S. IPO in the coming weeks, adding to a wave of blockbuster listings anticipated in the year ahead. Anthropic's rapid rise has rattled markets, triggering selloffs in software and IT stocks as investors worry its increasingly autonomous AI tools could accelerate disruption across industries.

At close to a $1 trillion valuation, Anthropic would vault into the top tier of the S&P 500. While a major boost for the long-sluggish IPO market, experts warn an offering of such scale could drain liquidity and investor attention from smaller listings.