Claude Fable 5.1 Is Here : and AI Just Got Cheaper, Faster, and Less Cautious
What happened Anthropic released Claude Fable 5.1 on September 1, 2026, alongside Claude Mythos 5.1, a restricted-access version for vetted cybersecurity and life-sciences organizations. The two models use identical weights, according to Anthropic. The important difference is in their safeguards and access rules. Fable 5.1 is generally available, while Mythos 5.1 has less restrictive controls […]