Anthropic has closed a $13 billion Series F funding round, lifting the AI startup’s valuation to $183 billion, according to people familiar with the deal cited by Reuters. The financing marks one of the largest private fundraisings in the sector this year.

The round drew support from major backers including Amazon and Google, underscoring how top technology companies continue to pour capital into artificial intelligence leaders. The size of the deal reflects intense investor demand for companies building advanced AI systems.

The new funding gives Anthropic significant resources to expand its research, products and computing capacity as competition in generative AI accelerates. It also highlights how quickly valuations in the sector have climbed amid expectations of long-term commercial growth.

While the deal strengthens Anthropic’s position in a crowded market, it also adds to broader questions about how the AI boom is being financed and how quickly those investments can translate into durable revenue and market share.