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Cumulus Labs: The Fastest Multimodal Inference OS
Cumulus Labs is a Y Combinator-backed company that the Fastest Multimodal Inference OS. The company participated in the Winter 2026 batch of Y Combinator.
Cumulus Labs is a fast multimodal inference provider, purpose-built for AI teams who want faster performance, lower costs, and zero infrastructure work on fine-tuned & open source models.
Most teams today are stuck choosing between bad options. Self-hosting inference means wrestling with configurations and babysitting infrastructure that slows/breaks at scale. Big providers like Fireworks are convenient but extremely expensive and idle GPUs.
Cumulus Labs was part of Y Combinator's Winter 2026 cohort, has a team of approximately 2 employees, and is actively operating.