Anthropic releases Claude Fable 5 AI with tight safety

On June 9, 2026, Anthropic released Claude Fable 5, its most advanced AI model yet, which is publicly available under strict safety controls. Key points include: it belongs to the new Mythos class, with the differentiating factors being safety features and intended users; Fable 5 is open to the public while Mythos 5 is restricted to approved partners working in cybersecurity. Safety measures involve classifiers that monitor for misuse, particularly in high-risk fields like cybersecurity and biology.

Fable 5 is noted for its strong performance in tasks such as coding and complex work. Pricing is set at $10 per million input tokens and $50 per million output tokens, with security implications for organizations as AI capabilities expand.