Amazon deployed $5 billion into Anthropic this week, anchoring the top funding rounds. The investment pairs capital with a partnership deal, marking one of the largest checks written in venture this cycle.

Only half of the top 10 rounds crossed $100 million, a dip from the typical mega-round frenzy. AI, autonomous systems, and biotech dominated the week's biggest deals.

The Anthropic round signals continued enterprise appetite for large language model startups. Amazon gains early access to Claude's capabilities while Anthropic secures runway to compete with OpenAI and other generative AI players. The partnership bundles investment with commercial terms, a structure becoming standard as corporations deepen their AI bets.

The funding landscape remains robust despite the pullback in $100 million-plus rounds. Later-stage startups in AI still command outsized capital inflows. Biotech and autonomous tech rounds rounded out the top performers, suggesting investor diversity beyond pure software plays.