Overview
- The White House ordered Anthropic to block access for non‑US nationals to its latest models, Mythos 5 and Fable 5, and Anthropic shut both models globally because it cannot reliably limit users by nationality.
- US authorities say the move was based on national‑security concerns, including claims that Mythos 5 can find and exploit software vulnerabilities and that Fable 5 could be bypassed by jailbreaks.
- The models remain offline and the action has disrupted businesses and projects that relied on Fable 5, with users reporting sudden losses of functionality and calls for contingency planning.
- European leaders at the G7 have publicly urged access and used the episode to push for investment in homegrown, open‑weight or locally deployable AI systems to reduce dependence on US infrastructure.
- The episode has triggered legal, regulatory and market follow‑ups, including court filings revealing Pentagon use of other commercial AI for targeting and unconfirmed reports of possible Chinese access, which US agencies say are under investigation.