The mechanism that took Fable 5 and Mythos offline was not a vulnerability, a breach, or a model failure — it was a letter. What that sequence establishes institutionally is that the US government can remove a frontier model from service faster than any corporate safety review, and without publishing its reasoning. The Techdirt account attributing the action to a years-old political grievance rather than a security determination makes the precedent sharper, not softer: if the threshold for a model takedown is political rather than technical, no published safety record protects against it. Enterprises that built production workflows on Claude-based APIs learned that the hard way — and the
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