Plural leads Callosum's $10.25M pre-seed funding round

27 February 2026

Callosum, a London-based startup founded by two Cambridge-trained neuroscientists, has raised $10.25M from Plural and ARIA (the Advanced Research and Invention Agency), the UK government body charged with unlocking scientific and technological breakthroughs, as well as several angel investors.

Ian Hogarth, Partner at Plural: "Callosum's vision for a multi-model, multi-chip future could be transformative and positions them to compete with the world's biggest chip and model makers. These are serious founders tackling a serious mission, which is exactly what we look for at Plural."

The funding will be used to expand its London-based team and scale its software. The startup will use ARIA's new test lab for startups to prove its AI chips can compete with Nvidia's. ARIA is committing £50m to the facility, called the Scaling Inference Lab. The lab aims to provide a shortcut to commercialise new technologies.

Founded by Danyal Akarca and Jascha Achterberg, Callosum is building systems-level software for this new paradigm. It lets AI developers run multiple models across a wide range of chips and extract performance benefits from new, AI-optimised hardware that outperforms existing tech for specific tasks. By enabling a more heterogeneous compute stack, Callosum's orchestration layer makes compute more efficient and powerful, while unlocking new AI capabilities by allowing different chip types to be used together.

Danyal Akarca, Co-founder of Callosum: "Big labs are currently betting that one model will rule them all. We think that's wrong, and our work proves this. Nature shows that real intelligence emerges from many systems working together. We've brought together incredible talent to enable a paradigm shift in how we build intelligent systems to solve real-world problems, with the infrastructure to make that possible, on any chip, anywhere in the world."

Jascha Achterberg, Co-founder of Callosum: "Everyone assumed chip diversity was a disadvantage to be managed. We saw the opposite, that it's an advantage to be exploited. We're not optimising one algorithm on top of the existing stack. We're using software to control all the levers across the entire system, extracting benefits from diversity that others dismiss. Plural understands this mission, and we're excited to build alongside them."

For more information, visit Tech.eu.

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