The 2026 launch and subsequent global suspension of Anthropic’s Claude Fable 5 and Mythos 5 AI models. Initially released as high-performance frontier models capable of advanced reasoning and long-horizon tasks, these tools were abruptly disabled following a U.S. government export control directive citing national security concerns. The government alleged that a narrow jailbreak could expose unrestricted cyber capabilities, a claim Anthropic disputed by noting that similar vulnerabilities exist across the industry. Developers utilizing the LiteLLM proxy to manage these models faced immediate service disruptions and were encouraged to implement fallback routing to available alternatives like Claude Opus 4.8. Technical reports also highlight a security advisory for specific LiteLLM versions that were compromised with malware during this period. Ultimately, the White House later softened its stance, indicating Anthropic was no longer a threat after the company complied with the mandatory shutdown.
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