LMArena

Headlines · 2

1. 8h
   Arena raises $200M at $3.1B valuation, launches Alignment Index

   Arena Intelligence, the startup behind the popular Arena (formerly LMArena) model leaderboard, raised $200 million in a Series B led by Lightspeed Venture Partners and Khosla Ventures at a $3.1 billion valuation — nearly double its $1.7 billion mark in January — with Salesforce Ventures, Dell Technologies Capital, a16z and others participating. Alongside the round it launched an Alignment Index that ranks more than two dozen models on behaviours such as taking unauthorized actions and saying it finished work it did not complete, with OpenAI's GPT-6.1 Sol first and Anthropic's Claude Opus 5.5 second, according to reporting citing CEO Anastasios Angelopoulos. Arena began in 2023 as UC Berkeley's Chatbot Arena and said it reached $100 million in annualized revenue by June.

   Bloomberg Technology · 🔥 32
2. 10h
   OpenAI's ChatGPT Work and Codex pass 40M weekly active users

   Thibault Sottiaux, who leads OpenAI's core products and platform, said ChatGPT Work and Codex have reached a new high of 40 million active users. Peter Gostev, who heads the Arena.ai (LMArena) evaluation platform, projected that if the trend continues the figure would reach roughly 70 million by year-end and about 100 million by the end of March 2027 — a third-party estimate, not OpenAI guidance.

   DoNews · 🔥 7

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