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Cumulus Compute Labs

Cumulus Compute Labs (also known as Cumulus Labs) is a YC W26 startup building high-performance GPU inference infrastructure. Their flagship product, IonRouter, is an inference routing platform powered by the IonAttention inference engine, designed to optimize LLM workloads at scale.

Company Info

Founded
2025
Headquarters
Unknown
Founders
Employees
Unknown
Website
https://ionrouter.io
Status
active

Funding

Undisclosed total

Related News

llm-inferenceinference-optimizationopenai-compatible-api
product launch IonRouter (YC W26) Launches High-Throughput LLM Inference Platform with Proprietary IonAttention Engine Mar 14th, 2026 ionrouter.ioproduct launch IonRouter (YC W26) Launches High-Throughput LLM Inference Service Claiming 2× Rival Throughput Mar 14th, 2026 ionrouter.io
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