The filing comes less than a week after Anthropic raised $65 billion in a Series H funding round that pushed its valuation to $965 billion. The round, which was co-led by Altimeter Capital, Dragoneer, Greenoaks, Sequoia Capital, Capital Group, Coatue, and D1 Capital Partners, attracted a bevy of institutional and strategic investors in anticipation of an IPO.

Anthropic’s confidential filing landed in an already white-hot IPO season that includes SpaceX’s initial public offering that is targeting a $2 trillion valuation. SpaceX is seeking to raise more than $75 billion.

A confidential IPO filing allows a company to begin preparing for a potential public offering without publicly disclosing detailed financial information, risks, or other internal business details. Anthropic will evaluate the IPO privately and without the critical eye of the public. If it follows through, Anthropic will file an S-1 registration document that will contain detailed information of the company’s financials, legal matters, risks, and a breakdown of who holds the most voting power.

It also comes as its rival OpenAI continues to raise funding, notably a $122 billion round in March at an $852 billion post-money valuation, and prepares for its own IPO. OpenAI is expected to file for an initial public offering, setting the stage for an IPO season that will pit the two largest AI labs against each other and test the market’s resolve and interest in artificial intelligence.