Anthropic has released Claude Fable 5, a publicly available version of its powerful but previously restricted Mythos model — complete with a new set of safety guardrails designed to keep its most dangerous capabilities out of the wrong hands. Along with this “safe for general use” model, Anthropic also released Claude Mythos 5, a version of Fable without the safety guardrails, to trusted testing partners.
Earlier this year, Anthropic announced a limited launch of Claude Mythos, a new model with advanced cybersecurity capabilities that Anthropic deemed too dangerous to release.
The company says Fable 5 is the most capable model it has ever made generally available, leading nearly all tested benchmarks across software engineering, knowledge work, vision, and scientific research. The more complex the task, Anthropic says, the wider Fable 5’s edge over its previous models and competitors.
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