Baseten is reportedly close to raising US$1.5 billion in a split-priced round, with some investors buying in at a US$13 billion valuation and others at US$11 billion.

Spark Capital, Sands Capital, Altimeter Capital, and Wellington Management are reportedly set to co-lead.

Baseten, a US-based AI inference startup, announced a US$300 million series E at a US$5 billion valuation in January 2026, about nine months after a US$150 million series D.

The company says it helps businesses run models for AI inference across managed cloud, self-hosted, and hybrid deployments.

Baseten has publicly cited users including Cursor, Mercor, Clay, OpenEvidence, Lovable, and Abridge.

Baseten also recently partnered with Benchling on inference tools for biotech customers.

🔗 Source: TechCrunch