LM Arena
LM Arena (formerly Chatbot Arena and LMSYS) operates the most cited public benchmark for large language models — a crowdsourced head-to-head evaluation platform that has scored Claude, GPT, Gemini and Llama side-by-side. Spun out of UC Berkeley in 2024 and based in the Bay Area, LM Arena raised a $100M seed round led by Andreessen Horowitz and UC Investments in May 2025 at a $600M valuation.
Company snapshot
- Active
- Total funding
- $100M
- Funding rounds
- 1
- Last round (Seed)
- $100M
- Last round date
- May 2025
- Founded
- 2024
- Employees
- 11-50
- Headquarters
- Berkeley, California, United States
Last round vs total raised$100M of $100M
Founders
Anastasios Angelopoulos, Wei-Lin Chiang, Ion Stoica
Industries
- Artificial Intelligence
- AI Evaluation
- Benchmarking
- Open Source
Notable investors
| Investor | Role |
|---|---|
| Andreessen Horowitz | Lead |
| UC Investments | Lead |
| Lightspeed Venture Partners | Co-investor |
| Felicis | Co-investor |
| Kleiner Perkins | Co-investor |