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9 h ago

Anthropic has shut down access to its Fable 5 and Mythos 5 models over the weekend, affecting both the API and desktop app. The models are no longer available, disrupting workflows that relied on them. Users must switch to less capable alternatives. Anthropic explained that the US government, citing national security, issued an export control directive suspending all access to these models by any foreign national, including foreign national Anthropic employees, both inside and outside the US. To ensure compliance, Anthropic abruptly disabled the models for all customers. This marks a significant use of export controls on AI software, similar to restrictions on encryption and high-end GPUs. Anthropic claims the directive stems from a report it believes enabled a "universal jailbreak," arguing that if applied to all frontier models, it could halt new deployments. Beyond the security debate, the sudden shutdown poses practical risks: businesses with critical agentic workflows face disruption if they depended solely on these models. The event highlights the need for router-based redundancy and raises concerns about what happens if multiple advanced models (e.g., GPT-5.5 successors) are simultaneously taken offline. It serves as a wake-up call for the importance of local AI serving, especially for essential workflows.