London-based AI infrastructure startup Callosum has raised $100 million in a seed funding round led by Atomico, with additional backing from Plural and the UK Sovereign AI Fund, the company announced today. Founded in 2024 by Cambridge PhD graduates Danyal Akarca and Jascha Achterberg, Callosum aims to address AI compute bottlenecks by enabling developers to route workloads across multiple AI models and hardware providers.
Callosum’s platform allows users to optimize AI workloads by distributing them across different chip architectures and cloud providers, reducing reliance on single systems and cutting costs. The UK Sovereign AI Fund’s investment marks the first for the government-backed initiative, which supports domestic AI startups as part of a broader £1.1 billion AI hardware plan. UK AI minister Kanishka Narayan highlighted the importance of efficient chip usage amid growing demand for AI compute resources.
The funding round underscores the increasing focus on AI infrastructure as demand for compute power rises globally. Callosum’s approach contrasts with companies that depend on single hardware vendors, positioning it alongside other infrastructure startups seeking to improve AI scalability and cost efficiency. The UK government’s involvement signals a strategic push to strengthen local AI capabilities and chip development, aligning with national technology priorities.
Callosum plans to use the $100 million seed funding to expand its engineering team and accelerate platform development. The UK Sovereign AI Fund, launched to boost Britain’s AI ecosystem, continues to back startups that enhance domestic AI infrastructure, with Callosum as its inaugural investment. The company’s next milestone will be scaling its platform to support a broader range of AI workloads across diverse hardware environments.