Callosum

Overview

Callosum is a London-based AI infrastructure company operating at the intersection of model systems and compute hardware. Its software is designed to distribute AI workloads across different models and chip architectures rather than relying on a single model or accelerator. The company describes this approach as “Heterogeneous Intelligence,” with systems that co-optimise models, workloads and silicon.

The company is notable for its UK research and engineering base, its founding team’s computational-neuroscience and systems background, and its selection as the first disclosed investment of the UK Sovereign AI Fund. Public information indicates an early-stage business focused on infrastructure software rather than consumer AI applications.

History

Callosum was founded in Cambridge by computational-neuroscience researchers Danyal Akarca and Jascha Achterberg. The founders’ backgrounds include work spanning neuroscience, AI models, chip design, kernels, cloud systems and hardware-software co-design. The company launched publicly in February 2026 as an “Intelligent Systems Company” focused on coordinating heterogeneous AI models and compute. It raised $10.25 million from Plural, ARIA and the UK Sovereign AI Fund, which named Callosum its first investment.

Product Lines

Manufacturing

Callosum does not appear to manufacture physical products. It develops systems software and APIs that orchestrate AI workloads across third-party chip architectures and models, with hardware-related deployments involving partners such as Rebellions and other accelerator companies.

Notable Products

• Heterogeneous Intelligence Platform - Software infrastructure that coordinates AI models, workloads and heterogeneous accelerator hardware.
• Tailored Inference APIs - APIs for routing tasks to combinations of models and chips suited to particular performance, cost or energy requirements.
• AI Compute Orchestration Layer - Systems software designed to co-optimise models, workloads and silicon across varied compute environments.

Reputation

Callosum is presented by UK government and technology sources as a technically focused AI-infrastructure startup addressing the fragmentation of modern compute. Its perceived strengths are the founders’ cross-disciplinary backgrounds, emphasis on hardware-software co-design and backing from Plural, ARIA and the UK Sovereign AI Fund. Public criticism and independent customer feedback remain limited because the company is newly established and its products are still early-stage. Employee and directory listings place it in the small-company range of roughly 11-50 people.