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YCW26· AI· Devtools

Cumulus Labs

The Fastest Multimodal Inference OS

ActiveChecked 20h ago
Batch
W26
Status, per YC
Active
Team size
2
HQ
San Francisco, CA
In W26199 companies, 80% AI

Founders

  • Veer ShahFounder/CEO

Same space

About Cumulus Labs

Cumulus Labs lets engineering teams ship AI in production without needing a dedicated ML platform team. Right now, companies building AI products are forced to stitch together separate vendors for routing, observability, evaluation, fine-tuning, and inference. This fragmented approach is brittle, expensive, and is a common reason enterprises fail with AI. We replace that entire stack with a single unified platform. Developers can keep their existing code while instantly upgrading to a unified platform that handles routing, semantic caching, continuous shadow evaluation, simulated data, and one-click fine-tuning. Behind the platform is Ion, our proprietary inference engine running on a custom NVIDIA Grace GPU fleet. Ion uses in-house custom GPU kernels to deliver 30 to 50 percent more throughput than standard vLLM or SGLang, giving our customers SOTA inference economics.

San Francisco, CA, USA

Cumulus Labs: questions

Which YC batch was Cumulus Labs in?

Cumulus Labs was in Y Combinator's Winter 2026 batch (W26).

Is Cumulus Labs still active?

Y Combinator lists Cumulus Labs as active.

Who founded Cumulus Labs?

Cumulus Labs's founders, as listed on its YC page: Veer Shah (Founder/CEO).

Where is Cumulus Labs based?

Cumulus Labs lists San Francisco, CA, USA as its location on YC's directory.

Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.

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