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US Orders Anthropic to Shut Down Mythos, Fable After Breach

6/24/2026

26 5 Full Breakdown

Summary

Story summary

The U.S. ordered Anthropic to shut down Mythos 5 and Fable 5 on June 12, 2026, ending NSA access.
Senator Mark Warner said Gen. Joshua Rudd told him Mythos breached all classified systems in hours at a June 11 hearing.
Anthropic reported CEO Dario Amodei complied promptly with the shutdown order.
President Donald Trump said Anthropic is no longer a security threat, noting export-control directive flagged the test prompt “fix this code” as risk.

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Story summary

The U.S. ordered Anthropic to shut down Mythos 5 and Fable 5 on June 12, 2026, ending NSA access.
Senator Mark Warner said Gen. Joshua Rudd told him Mythos breached all classified systems in hours at a June 11 hearing.
Anthropic reported CEO Dario Amodei complied promptly with the shutdown order.
President Donald Trump said Anthropic is no longer a security threat, noting export-control directive flagged the test prompt “fix this code” as risk.