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14,448 startups · 29 programs

Callosum

A new kind of AI and compute company: accelerating the coevolution of intelligence and chips.

WebsiteEF page

Why it ranks

How the rank works
10signal of 100 · rising 5
  • 10 open rolesHiring · Titles (titles.fru.dev), YC+4.2
  • on 4 Glyph sourcesSeen across Glyph · the registry (companies.fru.dev)+4
  • went through EFProgram · this site+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AICallosumShared: dev tools / infra, coevolution, chipEFLondonStartup →OtherEUCLYDShared: chipStartup →OtherPrime IntellectShared: computeStartup →
Companies closest to Callosum
Company
CallosumShared: dev tools / infra, coevolution, chipEF Not statedAI
EUCLYDnot in a program hereShared: chipElsewhereOther
Prime Intellectnot in a program hereShared: computeElsewhereOther

Adjacent

AIMatXShared: chipAI Grant Batch 2Startup →OtherLeafy LabShared: chip, acceleratingSPC 2025San FranciscoStartup →AIPamirAIShared: computeNeoStartup →AITattvamShared: chipSeedcamp 2025Startup →OtherUnconventional, IncShared: computeNeoStartup →
Companies next to Callosum
Company
MatXShared: chipAI Grant Batch 2Not statedAI
Leafy LabShared: chip, acceleratingSPC 2025Not statedOther
PamirAIShared: computeNeo Not statedAI
TattvamShared: chipSeedcamp 2025Not statedAI
Unconventional, IncShared: computeNeo Not statedOther

Also from EF in AI

All of EF
AIHyphenboxThe annotation stack for robotics and physical AI.EF 2026BangaloreStartup →AIIsochronicThe decision control system for enterprise agents.EF 2026San FranciscoStartup →AIAppstackAI-driven analytics for mobile apps.EF 2025ParisStartup →AIAutosetTargeted data generation for AI developers.EF 2025BangaloreStartup →AIGeneral ReasoningHelping companies deploy agents that undertake long-running tasks.EF 2025ExternalStartup →AINometriaShopify for AI-built businesses.EF 2025BangaloreStartup →
Company
HyphenboxThe annotation stack for robotics and physical AI.Not statedAI
IsochronicThe decision control system for enterprise agents.Not statedAI
AppstackAI-driven analytics for mobile apps.Not statedAI
AutosetTargeted data generation for AI developers.Not statedAI
General ReasoningHelping companies deploy agents that undertake long-running tasks.Not statedAI
NometriaShopify for AI-built businesses.Not statedAI

Programs

Programs Callosum went through
ProgramCohortSource
Entrepreneur FirstNo longer on the program's list2024EF Page

About Callosum

Category
AI
Location
London
Checked
6h ago

Tags: Dev Tools / Infra

Changes seen

Left a rosterOct 5, 2026

No longer on Entrepreneur First's list.

Source ↗
WebsiteSep 25, 2026

Website listed: callosum.com.

Source ↗
Company profileFundingleadersPaydayssocialstitles

Callosum: questions

Which accelerators did Callosum go through?

Callosum is listed by Entrepreneur First (2024).

Where is Callosum based?

Callosum lists London as its location on Entrepreneur First's page.