Opus 5.5 Is First Opus with Fable 5.1-Class Safeguards on Cyber, Bio, Frontier LLM Dev
ClaudeDevs · x · 2026-09-23
Anthropic explained Opus 5.5's safeguards: as models grow more powerful, safeguards are one way to prevent misuse. Opus 5.5 is the first Opus with Fable 5.1-class safeguards on cyber, bio, and frontier LLM development.
Flagged requests fall back to another model, and Anthropic says it is working to reduce incorrect flags.
Related event: Anthropic Launches Claude Opus 5.5: Stronger, 40% Cheaper, Tops AA Index(259 posts)→
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