Callosum raises €8.7M round
The startup will use the funding to expand its London-based team and scale its software.
“Big labs are currently betting that one model will rule them all. We think that's wrong and our work proves this. Nature shows that real intelligence emerges from many systems working together. We’ve brought together incredible talent to enable a paradigm shift in how we build intelligent systems to solve real-world problems, with the infrastructure to make that possible, on any chip, anywhere in the world.”
“Everyone assumed chip diversity was a disadvantage to be managed. We saw the opposite, that it's an advantage to be exploited. We're not optimising one algorithm on top of the existing stack. We're using software to control all the levers across the entire system, extracting benefits from diversity that others dismiss. Plural understands this mission and we're excited to build alongside them.”
Investors
Competitive Landscape
Direct startup competitors: SambaNova (Series E, $1.1B+ raised, full-stack AI platform), Groq (Series D, $1B+ raised, inference-focused LPU), and Cerebras Systems (Pre-IPO, wafer-scale hardware). Differentiates as a software-first orchestration layer for 'multi-model, multi-chip' heterogeneous compute rather than just proprietary silicon. Legacy incumbents: NVIDIA (owns ~85-90% market share with its CUDA ecosystem), AMD, and cloud providers like AWS and Google (TPUs). Market context: High-growth category of AI infrastructure aimed at breaking the single-chip monoculture through orchestration of diverse hardware.
About Plural
Notable portfolio companies: Helsing (defense AI, unicorn), Robin AI (legal tech, Series B), Proxima Fusion (clean energy, €20M seed), Unitary (content moderation, $15M Series A), Isometric (carbon removal), and Field (energy storage).
About Callosum
Source: https://tech.eu/2026/02/26/callosum-challenging-ai-silicon-valley-monoculture-comes-out-of-stealth/