An index of frontier and emerging AI labs.
Safety / evals
Operator of the Chatbot Arena LLM evaluation platform, and the AI Ranking & LLM Leaderboard
| Name | LMArena |
|---|---|
| Aliases | LMSYS, Chatbot Arena |
| Space | Safety / evals |
| Founded | 2023 |
| Latest valuation | $1.7B |
| Stage | — |
| Status | active |
| HQ | San Francisco |
| Founders | Wei-Lin Chiang, Anastasios Angelopoulos, Ion Stoica |
| Website | https://lmarena.ai |
| Careers | https://lmarena.ai/careers |
| — | |
| X / Twitter | — |
| Date | Round | Amount ($M) | Valuation | Confidence | Source |
|---|---|---|---|---|---|
| — | — | — | $1.7B | reported | — |
No founders recorded yet. Submit info.
| Date | Type | Title | Source |
|---|---|---|---|
| 2026-06-28 | edited | LMArena: summary updated summary: Operator of the Chatbot Arena LLM evaluation platform, originally an LMSYS / UC Berkeley project. Closed a $150M Series… → Operator of the Chatbot Arena LLM evaluation platform, and the AI Ranking & LLM Leaderboard | lmarena.ai |
| 2026-06-28 | edited | LMArena: description updated description: — → AI Ranking & LLM Leaderboard | lmarena.ai |
| 2026-06-14 | added | LMArena added to tracker Latest valuation: $1.7B. | — |
| Lab | Valuation | Founded |
|---|---|---|
| Patronus AI | ~$100M | 2023 |
| Atla AI | — | 2023 |
| Braintrust | — | 2023 |
| Galileo | — | 2021 |
| Haize Labs | — | 2023 |
| METR | — | 2022 |
| Scale Labs | — | 2026 |