Callosum, a London-based AI computing power scheduling platform, has successfully raised $10.25 million in a funding round led by Plural, with additional R&D funding from ARIA. The startup, founded by two Cambridge neuroscience PhDs, specializes in software that optimizes AI workloads across various chips, including Nvidia, AMD, AWS Trainium/Inferentia, Cerebras, and SambaNova, emphasizing multi-cloud and multi-chip collaboration. Callosum's technology reportedly delivers approximately twice the accuracy, seven times the speed, and a fourfold cost reduction compared to single-hardware solutions for complex enterprise tasks. The company is currently working with data center infrastructure vendors on new photonic interconnects and plans to expand into the US market while developing its own hardware infrastructure.