Fable 5.1 tops Artificial Analysis at 66, costs 20% more
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Leading the Artificial Analysis Intelligence Index carries a bill: per task, Claude Fable 5.1 runs 20% more than Fable 5, despite the 75% cut to cache read pricing that shipped with it. At max effort it scores 66 on the index, the top result on Artificial Analysis’s board.
Artificial Analysis says it supported Anthropic with pre-release evaluation of Claude Fable 5.1.
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Claude Fable 5.1 errors out if you edit past turns
Accounts created on or after August 31, 2026 get a 400 error if their agent loop edits anything before a thinking block on Claude Fable 5.1. Opting into drop_block strips the affected blocks instead, and they aren’t billed.
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