TL;DR

Callosum, a London-based AI computing power scheduling platform founded by two Cambridge neuroscience PhDs, has raised £7.6 million in a round led by Plural with additional R&D funding from ARIA (the UK’s Advanced Research and Invention Agency).

What Callosum does

The startup builds software that optimises AI workloads across different chip architectures, including Nvidia, AMD, AWS Trainium/Inferentia, Cerebras, and SambaNova. The platform emphasises multi-cloud and multi-chip collaboration rather than tying workloads to a single hardware vendor.

Callosum claims its technology delivers approximately twice the accuracy, seven times the speed, and a fourfold cost reduction compared to single-hardware solutions for complex enterprise tasks.

Growth plans

The company is working with data centre infrastructure vendors on new photonic interconnects and plans to expand into the US market. It also intends to develop its own hardware infrastructure alongside the scheduling software.

Looking forward

As enterprises grapple with rising AI compute costs and vendor lock-in across chip providers and cloud platforms, Callosum’s chip-agnostic approach addresses a growing pain point. ARIA’s involvement signals UK government interest in building domestic AI infrastructure capabilities.