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
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 |
Frequently asked questions
How much funding has LM Arena raised?
LM Arena has raised $100M in total funding across 1 round.
What was LM Arena's most recent funding round?
LM Arena's most recent round was a Seed of $100M in May 2025.
When was LM Arena founded?
LM Arena was founded in 2024.
Where is LM Arena headquartered?
LM Arena is headquartered in Berkeley, California, United States.
How many employees does LM Arena have?
LM Arena has 11-50 employees.
Who are LM Arena's investors?
LM Arena's notable investors include Andreessen Horowitz, UC Investments, Lightspeed Venture Partners, Felicis, Kleiner Perkins.