Anthropic's Claude Fable 5.1, currently first on the Artificial Analysis Intelligence Index and scoring 59.1% on Humanity's Last Exam, is available free through Arena's chat interface until September 5, with no payment card required. Users can sign in with Google or a temporary email at Arena, open Direct Chat, and run the model in a browser with no install. The trial is described as max-effort chat access; API calls are not included. Coverage of the window puts the cutoff at September 5, 08:00 PT. After Direct Chat closes, the model is expected to remain on the site in anonymous Battle Mode, where votes feed preference rankings rather than a named model picker.
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