Anthropic, the AI lab behind Claude, has secretly filed for an initial public offering, the company said in a blog post on Monday.
The company, which has a market capitalization of nearly $1 trillion, has filed a draft registration statement with the U.S. Securities and Exchange Commission for a proposed initial public offering. Anthropic has not yet listed any number of shares or set a price. Anthropic said the proposed initial public offering is subject to market conditions and other factors.
The filing comes less than a week after Anthropic raised $65 billion in a Series H funding round, pushing its valuation to $965 billion. The round, co-led by Altimeter Capital, Dragoneer, Greenoaks, Sequoia Capital, Capital Group, Coatue, and D1 Capital Partners, attracted a number of institutional and strategic investors in anticipation of an IPO.
Anthropic’s confidential filing comes during an already heated IPO season that includes SpaceX’s initial public offering, which is targeting a $2 trillion valuation. SpaceX aims to raise more than $75 billion.
It also comes as rival OpenAI continues to raise money, especially as it prepares for its own IPO after raising a $122 billion round in March at a post-money valuation of $852 billion. OpenAI is expected to file for an initial public offering, setting the stage for an IPO season that will see the two largest AI labs compete against each other and test the market’s resolve and interest in artificial intelligence.
Although Anthropic is now an AI powerhouse with top enterprise customers, it was once seen as an underdog in the emerging world of large-scale language models. The startup was founded in 2021 by former OpenAI employees and was long seen as a distant rival to OpenAI and its AI chatbot, ChatGPT.
The company attracted investors and customers with its growth capabilities and focus on enterprise services. This led to impressive revenue growth. The company recently announced a revenue run rate of over $47 billion, up from $9 billion at the end of 2025.
As Anthropic makes its Mythos model more widely available, its revenue growth rate could accelerate. Anthropic previewed Mythos in April, but access remained restricted and warned software developers that the model had discovered thousands of critical bugs that needed to be fixed before it could be made public.
Bloomberg reported Monday morning, citing unnamed sources, that the Generative AI Institute is ready to give access to Mythos to the European Union’s cybersecurity agency.
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