Benchmarks & Evals
Alignment Index
Arena launches the Alignment Index
Alongside its $200M raise, Arena launched the Alignment Index, listed in the episode's show notes.
Arena AI Releases: Alignment Index, Series funding ($200M) & Agent Arena
ThursdAI — the weekly AI news podcast hosted by Alex Volkov — has covered 5 Arena releases since Nov 2025, most recently Alignment Index on Oct 8, 2026. Highlights include Series funding ($200M), Code Arena, Agent Arena, Alignment Index. 1 of them shipped with open weights. Every entry below has primary-source links and the episode segment where we covered it live, plus key numbers where we have them.
5 releases1 open weight4 episodesNov 2025 – Oct 2026
October 2026 2
Funding
Series funding ($200M)
Arena raises $200M at a $3.1B valuation, broken live on ThursdAI
Arena raised $200 million at a $3.1 billion valuation; Peter Gostev broke the news live on ThursdAI. The focus now is Agent Arena, where you work with one agent and Arena learns from how you interact with it.
$200M raised$3.1B valuation
June 2026 1
Benchmarks & Evals
Agent Arena
Arena launches Agent Arena for real-world agent workflow evals
Arena (LMArena) launched Agent Arena during the episode, moving beyond one-turn chatbot preference battles to evaluate models on real agent workflows with web search, files, terminals, user corrections, and objective recovery signals. Peter Gostev joined live to explain why long-running, harder tasks need a different benchmark.
April 2026 1
DatasetsOpen weights
Arena historical leaderboard & prompt datasets
Arena releases 3 years of leaderboard data and prompts on Hugging Face
Arena (formerly LMArena) released three years of historical leaderboard data plus the actual user prompts as datasets on Hugging Face. Peter Gostev, who previously scraped the site by hand into Google Sheets for his charts, now builds his Compute Wars and model-trend analyses straight from the data.
November 2025 1
Benchmarks & Evals
Code Arena
LMArena launches Code Arena for live agentic coding evaluations
LMArena launched Code Arena, a live evaluation platform where models build real applications agentically and humans vote on the results. It extends the arena-style crowdsourced ranking approach to agentic coding workflows.
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