Anthropic releases powerful AI model Claude Fable

Anthropic has launched Claude Fable 5, the first public version of its advanced Mythos AI model. While excelling in software engineering, knowledge work, and vision, Fable 5 includes strict safety limits, deferring to Claude Opus 4.8 in high-risk domains like cybersecurity and biology. This release comes as Anthropic prepares for a public market debut and follows its call for a coordinated pause on frontier AI development due to concerns about recursive self-improvement. The company implemented extensive testing to prevent jailbreaks, but will now enforce a 30-day data retention policy for all traffic as a safety measure, potentially setting an industry precedent.