San Francisco, May 29 -- American AI startup Anthropic has reached close to a trillion-dollar valuation, surpassing its rival OpenAI even as both prepare for their stock market debut.

In a latest funding round, the Claude maker raised $65 billion, led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, valuing the company at $965 billion post-money.

Claude's adoption has continued to grow across global enterprises customers and the AI giant's run-rate revenue crossed $47 billion earlier this month, the company said.

"Claude is increasingly indispensable to our growing global community of customers, and we work tirelessly to make tools like Claude Code and Cowork more helpful, more powerful, and more adaptable to their need...