Gimlet Labs raises $300 million Series B at $3 billion valuation

Gimlet Labs raised $300 million in a Series B led by Andreessen Horowitz at a $3 billion valuation, financing the startup’s plan to run AI inference across multiple types of computing hardware.

The round takes Gimlet’s disclosed funding to $392 million, after a $12 million seed round and an $80 million Series A. The company’s Series B announcement named Sapphire Ventures, Menlo Ventures, 645 Ventures, Arm and 13 other firms among the participants. Andreessen Horowitz also led Vals AI’s $40 million Series A, announced in August.

By Gimlet’s account, its software traces a model, breaks it into phases and assigns each phase to GPUs, CPUs, near-memory processors or dataflow accelerators, depending on the hardware available and a customer’s service requirements. The idea is to avoid running an entire inference request on one type of chip when different parts of the request have different computing needs.

One split separates prefill—the compute-heavy processing of an input prompt—from decode, the memory-bandwidth-heavy work of generating tokens. Gimlet says the platform can also separate speculative decoding and divide attention operations from feed-forward network operations, and that its runtime can shift work to other available hardware when a preferred accelerator is saturated.

Gimlet claims those arrangements can produce five-to-tenfold speedups within the same power footprint, or comparable throughput gains without increasing latency. Andreessen Horowitz said in its investment announcement that the system has delivered gains of as much as tenfold in throughput and interactivity on frontier models within the same power envelope. Neither announcement supplied independently reproducible benchmarks for those figures.

The company also said that since its Series A announcement in March it has added billions of dollars in contracted revenue and gigawatts of data-center pipeline, and that it is scaling toward hundreds of megawatts of managed capacity. Its announcement did not identify customers or provide contracts or deployment records supporting those figures. Andreessen Horowitz said Gimlet’s customers include an unidentified frontier AI lab and hyperscaler.

The financing follows Gimlet’s March Series A and its $12 million seed announcement in October 2025. Gimlet did not disclose whether the $3 billion valuation is pre-money or post-money.