Humanloop
humanloop.com London UK company Seed
- Headquarters
- London
- Sector
- Developer tools
- Stage
- Seed
What does Humanloop do?
Humanloop built the tooling teams use to test whether a change to a prompt actually improved anything — evaluation, versioning and monitoring for LLM applications. A UCL spinout; its founding team joined Anthropic in 2025 and the product was retired.
How does Humanloop work?
Versioned prompts, ran evaluations against them and monitored production behaviour, so a change could be shown to help rather than assumed to. The product has been retired.
What does Humanloop offer?
Was an LLM development platform; the team is now at Anthropic.
Humanloop built enterprise developer software for evaluating, monitoring, and prompt-tuning large language models. Spun out of University College London in 2020 by computer science researchers Raza Habib, Peter Hayes, and Jordan Burgess, it was funded by Y Combinator and Index Ventures. In August 2025, artificial intelligence safety lab Anthropic acqui-hired the entire founding team to direct frontier model evaluation.
Where is Humanloop based?
Humanloop is headquartered in London. Other AI companies in London →
Why does Humanloop matter to a UK operator?
A UCL spinout whose founding team went to Anthropic and whose product was retired. A short, instructive arc in how AI tooling companies exit, and a warning about building on early-stage infrastructure.
What else is Torus tracking near Humanloop?
3 other UK companies working in Developer tools:
6 other AI companies headquartered in London: