Arena

Arena sells AI-model evaluations to labs, enterprises, and developers, using real-world human preferences to assess model performance and provide analytics, feedback samples, and SLA-backed results.

Source:arena.ai· Oct 9, 2026

arena.ai · updated Oct 13, 2026

Human data Evals and benchmarks

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Headquarters: San Francisco, United States
Source:linkedin.com· Oct 9, 2026
Founded: 2025
Source:linkedin.com· Oct 9, 2026
Headcount: 51-200
Source:linkedin.com· Oct 9, 2026
Total funding: $450M
Sources:arena.ai/company/about arena.ai/blog/series-b
Latest round: Series B, $200M, October 2026
Source:arena.ai· Oct 9, 2026

Trust & data

How the vendor protects buyer material, where its data comes from, and where it can run.

Trust center: trust.arena.ai
Source:trust.arena.ai· Oct 9, 2026
Other certifications: CCPAGDPRNIST CSF
Source:trust.arena.ai· Oct 9, 2026
Stated confidentiality practices: Unreleased models can be tested under anonymous labels; Arena shares their results privately with the provider and removes them from the platform. It removes personal and sensitive information before sharing data.
Source:arena.ai· Oct 9, 2026
Not publicly listed: SOC 2, Deployment, Data sources, Exclusivity

What they sell

Offerings: Human data Evals and benchmarks
Sources:arena.ai/blog/ai-evaluations arena.ai/blog/arena-100m-revenue· Oct 9, 2026
Domains: Coding Legal Medical Science Multi-domain
Source:prnewswire.com· Oct 9, 2026
Delivery formats: Managed serviceDatasets
Sources:arena.ai huggingface.co· Oct 9, 2026
Public samples & benchmarks: Arena Human Preference 140K
Arena-Hard-Auto
Search Arena 24K
Arena Expert 5K
Sources:huggingface.co (1)github.com huggingface.co/lmarena-ai huggingface.co (3)· Oct 9, 2026
Named customers: OpenAIGooglexAI
Source:prnewswire.com· Oct 9, 2026
Quote
LMArena works with leading AI labs and enterprises, including OpenAI, Google and xAI

Every change to these facts is kept in the public claims log. Record co_4ebe44bc9571.