Fable 5.1 improves cybersecurity capabilities with significant reduction in fallbacks
ClaudeDevs · x · 2026-09-02
Claude Fable 5.1 features improved cybersecurity safeguards, enabling it to identify vulnerabilities in user source code. Cyber-related fallbacks to Opus have decreased by approximately 40% compared to Fable 5 today, and 55% compared to the initial release of Fable 5.
Related event: Anthropic Releases Fable 5.1 and Mythos 5.1 with 75% Cheaper Caching(174 posts)→
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