Arena announced Claude Fable 5.1 access in Direct Mode through September 5, 2026
Arena said Anthropic’s model was already available in Battle and Agent Mode and would remain in both after the limited Direct Mode window.
TLDR
On September 3, 2026, Arena announced that users could test Anthropic’s Claude Fable 5.1 by selecting it from the Direct Mode dropdown. Arena said that access would run through September 5 at 8 a.m. PT, while the model would remain available in Battle and Agent Mode afterward.
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