Anthropic on Tuesday announced it has closed a $13 billion funding round at a $183 billion post-money valuation, roughly triple what the artificial intelligence startup was worth as of its last raise in March.

The most recent funding round was led by Iconiq, Fidelity Management & Research Company and Lightspeed Venture Partners. Other investors including Altimeter, General Catalyst and Coatue also participated, Anthropic said.

“This financing demonstrates investors’ extraordinary confidence in our financial performance and the strength of their collaboration with us to continue fueling our unprecedented growth,” Anthropic finance chief Krishna Rao said in a statement.

Anthropic’s valuation has been on a steep climb since it announced its AI assistant Claude in March 2023. The Amazon-backed startup was founded by former OpenAI research executives, including its CEO Dario Amodei.

OpenAI and Anthropic are fierce competitors in the AI market. OpenAI, which rocketed into the mainstream following the release of its AI chatbot ChatGPT in 2022, is preparing to sell stock as part of a secondary sale that would value the company at roughly $500 billion, as CNBC reported in August.

As of August, Anthropic said its run-rate revenue has reached over $5 billion, up from roughly $1 billion at the beginning of the year. Anthropic serves more than 300,000 business customers, the company said.

Anthropic said it will use its fresh capital to deepen safety research, meet growing enterprise demand and support international expansion.

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