---
format: "aidr-story-markdown/v1"
id: "ff110a507677c03db20915338bdf03e2b9c4c5f9b4f2223c94b60537834a462e"
canonical_url: "https://aidr.today/ff110a50?lang=en"
title: "Arena, which develops the popular AI model leaderboard, raised $200M at a $3.1B valuation, up from $1.7B in January, and launches an Alignment Index (Rachel Metz/Bloomberg)"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-10-08T16:20:02.000Z"
category: "Funding"
topics: ["funding","openai","safety"]
source_urls: ["https://www.techmeme.com/261008/p35","https://x.com/arena/status/2108226499560214777","https://x.com/ml_angelopoulos/status/2108229386092810606","https://x.com/arena/status/2108227732706676983","https://huggingnews.com/ai/arena-raises-200m-for-first-real-world-ai-safety-index-at-31b-valuation-c5ce6648","https://marketbrief.now/ai/arena-raises-200m-for-first-real-world-ai-safety-index-at-31b-valuation-c5ce6648","https://techcrunch.com/2026/10/08/popular-ai-leaderboard-arena-nearly-doubles-valuation-to-3-1b-valuation-in-10-months/"]
summary: "Arena, the developer of an AI model leaderboard, raised $200M at a $3.1B valuation, an increase from $1.7B in January. The company is also launching an Alignment Index."
---

# Arena, which develops the popular AI model leaderboard, raised $200M at a $3\.1B valuation, up from $1\.7B in January, and launches an Alignment Index \(Rachel Metz/Bloomberg\)

> [Open the canonical story](<https://aidr.today/ff110a50?lang=en>)

**Published:** 2026-10-08T16:20:02.000Z
**Category:** Funding
**Topics:** funding, openai, safety

## Summary

Arena, the developer of an AI model leaderboard, raised $200M at a $3\.1B valuation, an increase from $1\.7B in January\. The company is also launching an Alignment Index\.

## Sources

- [Story source](<https://www.techmeme.com/261008/p35>)
- [Story source](<https://x.com/arena/status/2108226499560214777>)
- [Story source](<https://x.com/ml_angelopoulos/status/2108229386092810606>)
- [Supporting source](<https://x.com/arena/status/2108227732706676983>)
- [Story source](<https://huggingnews.com/ai/arena-raises-200m-for-first-real-world-ai-safety-index-at-31b-valuation-c5ce6648>)
- [Story source](<https://marketbrief.now/ai/arena-raises-200m-for-first-real-world-ai-safety-index-at-31b-valuation-c5ce6648>)
- [Story source](<https://techcrunch.com/2026/10/08/popular-ai-leaderboard-arena-nearly-doubles-valuation-to-3-1b-valuation-in-10-months/>)