Callosum

Today we announce our $100M seed round to redefine how humanity computes in AI's next chapter.

The future of compute and AI is heterogeneous. Callosum is building it:
callosum.com/blog/seed-round

We have been named in the Budget’s prospectus 2026, as one of the most strategically important companies backed by the UK government.

We’re building heterogeneous compute: bringing different AI chips and models together into complete systems.

Thank you to the @UKSovereignAI and @ARIA_research.

We are just getting started.

Our CTO @achterbrain joined @nvidia on stage at the start-up day of GTC Berlin, alongside Clara Cornu, @talfanevans, @nouralhassan and Matteo Sarcinella.

He discussed how Callosum runs heterogeneous workloads efficiently across every generation and type of NVIDIA hardware, and what it takes to scale new technology companies fast in Europe.

Thanks for having us @nvidia

Our CTO, Jascha @achterbrain, joined The Compute 100 to discuss neuroscience, the multi-chip world and what we're building at Callosum.

Thanks for having us @gabyllorenzi @BSchech @thecompute100

We’re excited to release Tailored Inference, unlocking new frontiers in speed and cost-efficiency by optimising inference to the right models, algorithms and chips.

By leveraging the inherent structure of inference workloads, it allows us to decompose them to discover new solutions with improved cost-efficiency for our partners.