Arena ranks GPT-6 Astra Max first for web development, Claude Fable 5.1 Max first for agents
Arena's founders are turning model evaluation into a business by dividing "best" into tasks, costs and confidence intervals.
By RuntimeWire Staff · Published
Primary source: Arena
Why it matters
Arena is becoming part of the purchasing layer for AI models, using human votes and workflow traces to influence which systems developers adopt. Its latest tables also show why no leaderboard should be read as a universal measure: GPT-6 Astra Max led WebDev, while Claude Fable 5.1 Max led Agent Arena and GPT-6 Astra Max ranked second.
Arena, the AI evaluation platform co-founded by Anastasios Angelopoulos (@ml_angelopoulos), Wei-Lin Chiang (@infwinston) and Ion Stoica (@istoica05), ranked OpenAI's GPT-6 Astra Max first in its…
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