Callosum raises $10.25M to orchestrate AI workloads across mixed chip types

London-based Callosum, founded by two Cambridge neuroscientists, raised $10.25M led by Plural to build software that distributes AI tasks across chips from Nvidia, AMD, AWS Trainium, Cerebras, and SambaNova. The UK government's ARIA is providing separate grant funding. The startup's thesis draws from neuroscience: the human brain achieves intelligence by combining specialized cell types, not copying one type billions of times. Callosum aims to reduce dependence on banks of identical Nvidia GPUs by extracting performance advantages from heterogeneous chip architectures.

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