Claude Fable 5 - Technowatt

Claude Fable 5

Claude Fable 5 Brings Mythos Power With Safety Limits

Claude Fable 5 brings Anthropic's Mythos-class capabilities to public users, while classifiers block risky cyber, bio, and model-extraction requests.

technowatt - June 11, 2026

Claude Fable 5 arrives as Anthropic’s first public Mythos-class model

Claude Fable 5 is Anthropic's first broadly available Mythos-class model, adding safeguards that route sensitive requests to Opus 4.8.

technowatt - June 9, 2026

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