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AWS announces Claude Fable 5, the first generally available Mythos-class model

calendar_today June 9, 2026 person aws@amazon.com domain amazon-ebs

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.

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