LMArena
San Francisco, California, United States · Artificial Intelligence, Machine Learning
LMArena is an open community platform for evaluating AI models, aiming to bring scientific rigor to AI reliability. It provides a neutral, reproducible infrastructure that allows researchers, developers, and users to understand AI model performance in real-world scenarios. With a focus on community-driven science, LMArena facilitates open evaluation and makes AI assessments transparent and reliabl
Key facts
- Headquarters
- San Francisco, California, United States
- Employees
- 109
- Industries
- Artificial Intelligence, Machine Learning
- Status
- Private
- Website
- lmarena.ai
- Company page
Recent activity at LMArena
- : Arena closes $200M Series B at $2.88B valuation to advance AI evaluation and launches Alignment Index for agent safety.
- : LMArena raises $150 million in a new funding round, tripling its valuation to $1.7 billion. Co-led by Felicis and UC Investments, the funds will enhance its platform and research capabilities.
- : LMArena secures $100M in seed funding led by a16z and UC Investments to enhance AI model evaluation with a rebuilt platform.
LMArena funding history
| Date | Round | Amount |
|---|---|---|
| Oct 2026 | Series B | $200.0M |
| Jan 2026 | Venture | $150.0M |
| May 2025 | Seed | $100.0M |
Leadership
- Tye Tolentino, VP, People & Talent | Scaling AI & Deep-Tech Teams | People Strategy & Culture | DEIB | IPO & M&A | Executive Hiring | People Analytics
- Joyce Lin, Head of Developer Relations
- Anastasios Angelopoulos, Chief Executive Officer
- Wei-Lin Chiang, Founder
Verified email and direct lines for LMArena’s decision-makers are on Fundz. See plans — or book a 15-minute walkthrough.
LMArena in the news
- LMArena lands $1.7B valuation four months after launching its product - TechCrunch (Jan 06, 2026)
- AI evaluation platform LMArena is becoming a real startup - SiliconANGLE (Apr 17, 2025)
- AI startup LMArena triples its valuation to $1.7 billion in latest fundraise - Reuters (Jan 06, 2026)
- LMSYS Chatbot Arena: Live and Community-Driven LLM Evaluation - LMSYS Org (Mar 01, 2024)
- LMArena Secures $150M to Build the World’s Most Trusted AI Evaluation Platform - AI Insider (Jan 07, 2026)
- Google’s Gemini 2.5 Pro model tops LMArena by close to 40 points, outperforms competitors in scientific reasoning - R&D World (Mar 25, 2025)
- Scale AI launches Seal Showdown, an alternative to LMArena leaderboard - Mashable (Sep 22, 2025)
- Chatbot Arena Rebrands as LMArena, Becomes a Company - Maginative (Apr 17, 2025)
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About LMArena: questions and answers
What does LMArena do?
LMArena is an open community platform for evaluating AI models, aiming to bring scientific rigor to AI reliability. It provides a neutral, reproducible infrastructure that allows researchers, developers, and users to understand AI model performance in real-world scenarios. With a focus on community-driven science, LMArena facilitates open evaluation and makes AI assessments transparent and reliabl
Where is LMArena headquartered?
LMArena is headquartered in San Francisco, California, United States.
How many employees does LMArena have?
LMArena has about 109 employees.
Has LMArena raised funding?
Yes. Fundz has recorded 3 funding events for LMArena. The most recent, Series B of $200.0M, was in Oct 2026.
Who leads LMArena?
Anastasios Angelopoulos is a Chief Executive Officer at LMArena.
What is the latest news on LMArena?
On Oct 08, 2026, Arena closes $200M Series B at $2.88B valuation to advance AI evaluation and launches Alignment Index for agent safety.
Source: Fundz records from SEC filings, press releases and company announcements. How Fundz measures data accuracy