Amazon Report Triggers U.S. Government Block on Anthropic’s Fable 5 and Mythos 5 AI Models

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2026-06-15 07:10:02

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An internal Amazon security report uncovered vulnerabilities in Anthropic's Fable 5 AI model, prompting CEO Andy Jassy to escalate concerns to the Trump administration on June 12, 2026. Within 48 hours, U.S. officials imposed access restrictions barring foreign nationals—including some Anthropic employees abroad—from using both Fable 5 and its counterpart Mythos 5.

The decision followed Amazon's identification of flaws affecting four software environments during specific queries. National Cybersecurity Director Sean Cairncross and Commerce Secretary intervened, transforming a technical assessment into a geopolitical action. Anthropic disputes the severity of the vulnerabilities, arguing comparable risks exist in rival AI systems.

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