A generally available Mythos-class Claude 5 model with stronger safeguards for broad use.
- Jun 9, 2026
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Releases
Aug 7, 2026Claude Fable 5 receives updated biology safeguardsModel update
Anthropic updated Claude Fable 5's biology safeguards as part of its safety work for high-capability models.
Jun 9, 2026Claude Fable 5 releasedModel release
Anthropic released Claude Fable 5, a Mythos-class model adapted with safeguards for general use across Claude products and the API.