On May 28, 2026, Anthropic announced it had raised $65 billion in Series H funding at a $965 billion post-money valuation. The round was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. The valuation made Anthropic the most valuable standalone AI startup, edging past OpenAI’s most recent private valuation.
In the announcement Anthropic said its run-rate revenue had crossed $47 billion earlier in May 2026, reflecting rapid enterprise adoption of Claude since the company’s Series G earlier in the year. The company said the capital would fund safety and interpretability research, expand compute capacity to meet demand for Claude, and scale the products and partnerships its customers rely on.
The size of the round, less than four months after a prior raise, underscored how quickly capital was flowing to the leading frontier labs in 2026. For a business reader, the figure is a marker of how large the AI infrastructure and model-development arms race had become, with single private rounds now rivaling the market capitalizations of established public technology companies.