Anthropic today announced it has closed a $13 billion Series F funding round led by ICONIQ, at a $183 billion post-money valuation—roughly triple its valuation in March. Co-leads Fidelity Management & Research Company and Lightspeed Venture Partners joined the round, alongside a syndicate that includes Altimeter, General Catalyst, Coatue, GIC, Qatar Investment Authority, and others.

The company disclosed that its run-rate revenue has surged from approximately $1 billion at the start of 2025 to over $5 billion as of August, making Anthropic one of the fastest-growing technology companies in history. Anthropic now serves over 300,000 business customers, and the number of large accounts—customers that each represent over $100,000 in run-rate revenue—has grown nearly 7x in the past year. The developer tool Claude Code, fully launched in May, already contributes over $500 million in run-rate revenue, with usage growing more than 10x in three months.

Anthropic said it will use the capital to expand capacity for enterprise demand, deepen safety research, and support international expansion. The company, founded by former OpenAI executives including CEO Dario Amodei, competes directly with OpenAI, which is preparing a secondary stock sale that could value it at roughly $500 billion.