Anthropic updates Claude Fable 5's biology safeguards to reduce false positives, cutting biology-related 'fallbacks' by ~85% in testing across product surfaces (Anthropic)

Anthropic: Anthropic updates Claude Fable 5's biology safeguards to reduce false positives, cutting biology-related “fallbacks” by ~85% in testing across product surfaces — We're making updates to Claude Fable 5's biology safeguards in a way that substantially reduces false positives.

Anthropic says 'some routine tasks like coding and debugging' on Fable 5 'will fall back to Opus 4.8' in 'the near term' as it works to 'reduce false positives' (@anthropicai)
Anthropic says Claude Fable 5 uses conservative safety classifiers that trigger a fallback to Claude Opus 4.8 in <5% of sessions, in areas like cybersecurity (Anthropic)

Source: Techmeme | 2026-08-07

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