A Cambridge-founded AI infrastructure company has raised $100 million in one of Europe's largest seed funding rounds, highlighting growing UK investment in the technology behind the next generation of artificial intelligence.

Callosum, founded by Cambridge scientists Danyal Akarca and Jascha Achterberg, is developing software that can route different parts of an AI workload across different models and computer chips, rather than relying on a single hardware system. The company says this approach can improve speed, cost efficiency and energy use.

The funding round was led by Atomico, with participation from Plural, DCVC and the UK's Sovereign AI Fund. Callosum had previously raised $10.25 million before securing the latest investment.

The company's technology comes as businesses face growing costs from AI computing and increasing demand for specialised chips. Its platform is designed to match individual AI tasks with the hardware and model best suited to the job.

The UK's Sovereign AI Fund investment is particularly significant as Britain seeks to strengthen its domestic AI ecosystem and develop more technology companies capable of competing internationally.

The funding highlights a shift in Britain's AI ambitions—from simply developing AI models to building the computing infrastructure needed to run them efficiently.