Callosum
London, United Kingdom
◆ Total Raised
$100M
◆ Stage
seed
◆ Location
London, United Kingdom
◆ Founded
2025
◆ Team size
11-50
◆ Links
◆ About Callosum
London-based AI infrastructure startup whose platform helps developers route workloads across different AI models and hardware providers to reduce costs.
◆ What sets it apart
It co-optimizes workloads across different AI models and chip architectures in real time, rather than assuming a single homogeneous GPU stack.
◆ Sectors
◆ Business
ModelSaaS
CustomerAI engineering teams, infrastructure teams, and companies running large-scale AI workloads
◆ Notable
- Came out of stealth in February 2026
- Raised $10.25M in pre-seed funding
- Later announced a $100M seed round with participation from Atomico, DCVC, Plural, Norrsken VC, and the UK Sovereign AI fund
◆ Backing funds on Raise
◆ Funding rounds
◆ Explore the market
◆ FAQ
What does Callosum do?
London-based AI infrastructure startup whose platform helps developers route workloads across different AI models and hardware providers to reduce costs.
Where is Callosum based?
Callosum is based in London, United Kingdom, founded in 2025.
How much has Callosum raised?
Callosum has raised $100M in tracked funding and is currently at the seed stage.
Who has invested in Callosum?
Investors in Callosum include Atomico, DCVC, Plural, Norrsken VC, UK Sovereign AI fund, ARIA, Charlie Songhurst and Stan Boland.