Arena
Arena evaluates AI models through comparisons and observations of how people use them in real tasks.
$200MSeries B
ParticipantAP
AMP PBC
Activity from announced rounds
Activity in this selectionnomura-real-estate-development-co-f095adde
- Rounds participated in
- 3
- Confirmed lead rounds
- 0 2 roles undisclosed
- New companies
- 3 First participation on record · 0 follow-on
- Funding in participating rounds
- $1.4B 3 disclosed · full round size, not this investor’s share
By stage
By primary sector
By country
Rounds
3 in this selectionRiver AI
Builds infrastructure for training and serving personally trainable AI agents
$1.1BSeed+Series A
Role not disclosedOpenRouter
Provides a unified API gateway enabling access, routing, and optimization across 400+ AI models for developers and enterprises
$113MSeries B
Role not disclosed