Callosum has raised a $100 million seed round led by Atomico to build a global platform that orchestrates AI workloads across different models, chips and infrastructure based on requirements such as cost, speed and energy efficiency. Plural, DCVC and the UK Sovereign AI Fund participated significantly in the financing alongside additional investors and angel backers. The round also marks the first investment made by the UK Sovereign AI Fund.
Callosum is building around what it calls “heterogeneous intelligence,” an approach that treats AI infrastructure as a combination of specialized models and processors rather than relying on a single model or computing architecture to handle every workload.
The company’s thesis is that the rapidly expanding number of AI models and specialized chips creates an orchestration problem.
Instead of asking which individual AI model or accelerator is best overall, Callosum aims to determine which combination of models and silicon can perform individual parts of a workload most effectively under specified constraints.
The company calls this approach programmable heterogeneity.
Its technology breaks AI workloads into component tasks and directs each task to the model and processor best suited to execute it, based on factors including performance, energy consumption, and cost.
Callosum believes this approach can improve both the capabilities and economics of increasingly complex AI systems.
Alongside the financing, the company announced its first group of global computing partnerships.
Callosum has entered into a flagship partnership with Cerebras to deliver ultra-low-latency heterogeneous multi-agent AI systems at scale.
The company is also partnering with next-generation semiconductor developer Rebellions as well as infrastructure providers and original equipment manufacturers globally.
Those relationships are intended to let Callosum integrate multiple computing architectures into a unified platform, rather than tying customers to one hardware supplier.
Callosum is also bringing what it calls Tailored Inference into production.
The offering provides AI inference optimized around particular tasks and delivered through a family of APIs running across heterogeneous computing infrastructure.
Callosum said it is applying the technology across areas including advanced cybersecurity and finance.
The company sees the architecture as particularly relevant as specialized processors proliferate alongside GPUs and AI models become increasingly optimized for distinct use cases.
Callosum also connects heterogeneous computing to AI sovereignty.
Its platform is intended to allow countries and enterprises to deliver advanced AI capabilities using the combination of processors and infrastructure available to them rather than depending exclusively on a single semiconductor supplier.
That strategy helped make Callosum the first investment from the UK Sovereign AI Fund.
The company has also been named as part of the UK’s £1.1 billion AI hardware strategy.
Callosum plans to use its $100 million financing to develop the orchestration platform, expand integrations with semiconductor and infrastructure partners, and commercialize heterogeneous AI systems globally.
KEY QUOTES:
“AI is nothing without the chips that underpin it, and the eye-watering demand for them is only going to grow. In the race to develop and use AI, success will depend not just on having access to those chips, but on using them as efficiently as possible.”
Kanishka Narayan, Minister For Artificial Intelligence, UK Government
“By integrating Cerebras into Callosum’s platform, we’re making ultra-low-latency inference available exactly where it creates the greatest impact, enabling customers to build AI systems that simply weren’t practical before.”
Andy Hock, Chief Strategy Officer Of Cerebras
“Working with Callosum puts our architecture into systems alongside hardware chosen for different parts of the workload, instead of asking one chip to do every job. That’s the difference between a partnership and a deployment that only works in one environment or geography.”
Sunghyun Park, CEO Of Rebellions
