Anthropic is closing one of the largest private tech funding rounds ever, raising over $10bn in new commitments at a $350bn valuation. The AI startup's revenue run rate hit $9bn by end-2025, doubling from roughly $4bn the previous summer. Coatue Management and Singapore's GIC are leading the round, each investing about $1.5bn.

This massive capital injection reflects the intense financial demands of frontier AI infrastructure. Anthropic has already committed $50bn to build US data centers, while prior investors Microsoft and Nvidia have pledged $15bn combined. The round's scale highlights how much funding is needed to compete in the rapidly consolidating generative AI market.

Investors are betting on Anthropic's enterprise traction, particularly its Claude assistant and new autonomous coding model. Yet questions linger about the sustainability of such high valuations amid soaring infrastructure costs. The deal's completion will be closely watched as a bellwether for private AI investment appetite in 2026.