Anthropic Claude Fable 5 on AWS: Mythos-class capabilities with built-in safeguards now available

Updated on June, 12, 2026 – Claude Fable 5 and Claude Mythos 5 on Amazon Bedrock access unavailable To support compliance with the US Government export control directive, Anthropic has asked AWS to revoke access to Claude Fable 5 and Claude Mythos 5 for all users. All other models, including Opus4.8, are not affected and you can continue using them in full confidence. Please view the Anthropic statement for further details.