中/EN
Flash

Flash·Companies & Capital·2026-10-10 02:06

Arena Raises $200M Series B at $3.1B Valuation

San Francisco-based AI evaluation platform Arena has announced a $200 million Series B at a $3.1 billion valuation. Born from UC Berkeley's LMSYS research project, the company now tracks more than 1,000 open and closed models.

HIMIAO Horizon·2026-10-10 02:06·1 min read

Listen Save Share card Copy link
Large screen in a bright office showing an AI model leaderboard with rising charts, gold coins and a rocket motif
From a Berkeley research project to a $3.1B valuation: Arena turned crowdsourced model rankings into enterprise business.

What happened

The round was led by Lightspeed and Khosla Ventures, with participation from a16z, Salesforce Ventures, and others. Arena also disclosed annualized revenue above $100 million.

Alongside the raise, Arena launched the Alignment Index, a new metric for how well AI systems align with human values and safety.

Key facts

  1. Raise and valuation:$200M Series B at a $3.1B post-money valuation.
  2. Investors:led by Lightspeed and Khosla Ventures, with a16z, Salesforce Ventures, and others participating.
  3. Business base:spun out of Berkeley's LMSYS project (the origin of Chatbot Arena); now tracks 1,000+ open and closed models with ARR above $100M.
  4. New product:the Alignment Index, measuring AI safety and alignment with human values.

Why it matters

Arena's annualized revenue has passed $100 million and it tracks more than 1,000 open and closed models; alongside the round it launched the Alignment Index to measure how well AI aligns with human values.
Useful Tap if this story helped you

SourcesFinsmes (2026-10-09, source); TechStartups (2026-10-09, source). This article is a compilation of public information and does not constitute investment advice.

From HIMIAO Horizon · himiao.ai

ARENAAI EVALUATIONFUNDING

Comments

  1. Loading comments…

Related

  1. Oct 9Vesta Raises $30M for AI Mortgage Software, Revenue Up 12x
  2. Oct 8Isomorphic Labs in Talks at a $40–50B Valuation; No Drug Yet in Human Trials
  3. Oct 7US Government, Meta and Google Join Biohub's $1.8B Open Dataset Effort for Biology AI
  4. Oct 6Etched Fields $40–50B Funding Bids: No Shipped Chips at Scale, Valuation Doubles in Three Months
  5. Oct 6OpenAI in Talks for $30B Round at $1.4T Valuation, With UAE Funds and BlackRock Circling

Today

Oct 19 Monday

Latest news

All →
  1. Oct 18Anthropic to Commit 5% of Shares to New Public Benefit Fund
  2. Oct 19Stably AI's Orca Tops GitHub Daily Trending: One Desktop App to Orchestrate 30+ Coding Agents
  3. Oct 19Jailbroken PS5 Becomes a Local AI Server: Qwen3.8-27B Hits ~20 tok/s, Small Models Top 100
  4. Oct 19Anthropic Internal Study: Junior Share of Technical Staff Falls to 14%, Meeting Time Up 20%
  5. Oct 18Claude Cracks 25-Year Cryptography Mystery in Half an Hour: NIST Curve Seeds Came From a 1997 Clock
  6. Oct 18OpenCode Hit by "Distillation Attack": API Keys of About 1.4% of Users Compromised
Ask the cat