Callosum raises $100M led by Atomico in one of Europe’s largest seed rounds

Tech Funding News Sofia Chesnokova 20 August 2026, 08:53 ● Covered by 3 sources

Callosum raised $100 million in seed funding led by Atomico, following a $10.25 million pre-seed earlier in 2026.

Why it matters

Callosum, a London-based startup, has raised a $100 million seed round, one of the largest ever in Europe,…

Callosum Atomico

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TLDRocket 19 October 2026

Nvidia’s latest open-model push set the tone for AI’s next phase: less “big chat,” more dependable agent infrastructure. Alongside its enterprise pitch, the company released Nemotron 3.5 Super VL, a 120-billion-parameter multimodal model aimed at always-on corporate agents, and followed with Nemotron 3.5 Bolt, a locally runnable, laptop-focused variant. Artificial Analysis reports Super VL lands 26 points on its 10-benchmark Intelligence Index while using about 60% less text than the prior Nemotron 3 Super—an efficiency bump that matters when tokens are your operating cost, not your poetry. Nvidia also shifted availability toward faster, leaner deployments, including new quantized variants and updated API token pricing designed for long-running workflows.

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Callosum raises $100M led by Atomico in one of Europe’s largest seed rounds

Why it matters

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