The racks will run through a partnership with Callosum, a London-based AI compute startup that last week raised about $100 million in seed funding led by Atomico, with backing from the UK's Sovereign AI Fund.
"The partnership with Callosum allows our chips to work alongside other specialized hardware, with different components handling different parts of an AI workload," said Rebellions Chief Executive Park Sung-hyun.
Callosum was the fund's first disclosed equity investment.
Founded in 2025 by two Cambridge University neuroscientists, Callosum develops software that routes AI workloads to the chips and models best suited to each task.
Rebellions will join as Callosum's lead partner in Asia. The two companies are jointly designing a reference architecture that positions Rebellions' NPUs as inference-only hardware within Callosum's heterogeneous computing platform, allowing customers to deploy NPU-based infrastructure without separate optimization work.
Rebellions said the initial supply of more than 100 racks would mark the first phase of the project, with further shipments expected in later stages as it seeks to accelerate its push into sovereign AI markets across Britain and Europe.
AJP Takeaways
• The racks run through Callosum, a London startup that raised about $100 million led by Atomico and was the first disclosed investment of the UK's Sovereign AI Fund.
• Rebellions' ATOM NPUs pair with Callosum's vendor-neutral routing layer, positioning the Korean chipmaker against Nvidia's dominance in inference hardware.
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