Callosum raises €85.4 million seed to link AI models and chips
Callosum, a London startup founded in 2025, has raised €85.4 million in a Seed round led by Atomico with participation from Plural, DCVC and the UK Sovereign AI Fund to advance what it calls "heterogeneous intelligence." The funding follows an €8.76 million pre-seed and support from ARIA, and the company said the investment will back global compute partnerships, including a flagship Cerebras Systems deal, advances in programmable heterogeneity, and rollout of Tailored Inference APIs already used in cybersecurity and finance. UK government backing and placement in a national AI hardware plan could accelerate infrastructure adoption and cross-silicon orchestration.
Callosum raised €85.4 million to build heterogeneous inference infrastructure
Context
Callosum raised a pre-seed round in February 2026 and the UK launched a sovereign AI fund in April 2026. The company now announced global partnerships and production APIs. Next steps include scaling partnerships and API deployment.
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