Callosum

Callosum is an AI infrastructure company building systems-level software that enables AI workloads to run efficiently across heterogeneous chip architectures from various manufacturers. The company challenges the industry's reliance on homogeneous computing by creating infrastructure where diverse chips and intelligence co-evolve, aiming to unlock orders-of-magnitude improvements in capabilities and cost. Callosum unifies heterogeneous silicon, publishing frontier research and engineering it into production systems that bring together compute primitives from different chip makers. The company targets teams building AI for the world's hardest problems and chip makers developing new silicon, operating at the intersection of disciplines including hardware architecture, systems software, and machine learning. Founded in 2025 and headquartered in London, United Kingdom, Callosum has raised $10.25 million in Seed funding from investors including Plural, Aria, and Bare Metal Ventures.