Claude Mythos 5.1 excludes UK AI Security Institute from testing for the first time
S_OhEigeartaigh · x · 2026-09-09
Per the FT, Anthropic's newly launched Claude Mythos 5.1 is only available to vetted US organizations, excluding the UK's AI Security Institute — the global leader in frontier model testing — for the first time. Commenters argue this doesn't mean commercial AI access to Europe will close: revenue incentives push companies to keep US/EU access aligned, though cyber/defense procurement rules in the EU are the real worry.
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