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Claude Fable 5.1 Refuses Less: What Actually Changed

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

Fable 5.1 refuses benign elementary biology and medical questions 85 percent less often than Fable 5 Cybersecurity false positives are down 60 percent, and identifying vulnerabilities is now allowed while exploit generation is not A refusal arrives as HTTP 200 with stop_reason refusal, so code that…

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  1. 2026-09-02 00:45 · DEV Community — AI
    Claude Fable 5.1 Refuses Less: What Actually Changed

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