NewsMV
Fable 5.1, the latest release from Anthropic, includes changes meant to reduce token cost and to cut false-positive restrictions from the model's safety guardrails.
The update targets two friction points that builders running the model have persistently raised. The token cost reduction is the change with the most direct economic read for high-volume users.
Anthropic has not published specific figures. The guardrail adjustment is narrower than its framing suggests.
The aim is false positives specifically, cases where the model declined or restricted requests it should have cleared, rather than a broad policy loosening.
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