LM Arena logoCompany profile

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.

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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

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InvestorRole
Andreessen HorowitzLead
UC InvestmentsLead
Lightspeed Venture PartnersCo-investor
FelicisCo-investor
Kleiner PerkinsCo-investor

Frequently asked questions

LM Arena has raised $100M in total funding across 1 round.

LM Arena's most recent round was a Seed of $100M in May 2025.

LM Arena was founded in 2024.

LM Arena is headquartered in Berkeley, California, United States.

LM Arena has 11-50 employees.

LM Arena's notable investors include Andreessen Horowitz, UC Investments, Lightspeed Venture Partners, Felicis, Kleiner Perkins.

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