Sail Research is the infrastructure company purpose-built for long-horizon AI agents. Sail's platform combines two core components: an inference stack rebuilt from the ground up for throughput and efficiency, delivering up to 10x lower cost per token; and Sailboxes, a stateful sandbox environment designed to run for days rather than seconds. Together, they give teams the economics and scale to build agents that are maximally ambitious. Sail is backed by Kleiner Perkins, Sequoia, Redpoint Ventures, Theory Ventures, Vine Ventures, CRV, A*, and Abstract Ventures.

Key Contact

Funding Events

Date	Amount	Type	Investors	Valuation
06/25/26	$80,000,000	Seed and Series A	A* Abstract Ventures CRV John Hennessy Kleiner Perkins Caufield and Byers Lip-Bu Tan Redpoint Ventures Sequoia Capital Theory Ventures Tri Dao Vine Ventures	$450,000,000