Anthropic releases its first Mythos-class model Claude Fable 5

Anthropic releases its first Mythos-class model Claude Fable

Anthropic launched Claude Fable 5, calling it the most capable model it has ever released widely. It excels at software engineering, knowledge work, and vision, with its lead growing on longer, more complex tasks. This is the first broad release from the Mythos family, previously deemed too dangerous because of cybersecurity capabilities. New safeguards that block responses in specific high-risk areas made the release possible. The post doesn't disclose benchmarks, pricing, or a launch date.

Why it matters: First public Mythos-class model from Anthropic, previously withheld for safety reasons. Long-horizon task gains and a new safety interceptor are concrete new info. HKR all hit; this is an industry-shaking release.