In detail
- Directive arrived Friday evening; Anthropic completely turned off access to Fable 5 and Mythos 5 to comply.
- Reports say Amazon CEO Andy Jassy and at least five other firms raised concerns with the government.
- Anthropic says it received only verbal evidence of a narrow, non‑universal jailbreak and notes similar capabilities exist in other models like GPT‑5.5.
- Security research allegedly showed Fable could be prompted into producing information usable for cyberattacks; experts disagree on whether this constitutes a true jailbreak.
Why it matters
Government-ordered removals of frontier models demonstrate that access to critical AI capabilities can be curtailed rapidly for national-security reasons, affecting availability, vendor risk and international deployments.
For you Check which frontier models your vendors rely on and plan contingencies for sudden access restrictions or regional blocks.
Updates
Anthropic suspends access to its new Fable 5 and Mythos 5 models for foreign nationals following a U.S. government directive.
- Directive blocks foreign nationals, including Anthropic's foreign employees, from using the models
- Move comes shortly after Anthropic announced a partnership with Tata Consultancy Services in India
- Reports link initial security concerns to input from Amazon CEO Andy Jassy; Anthropic disputes the government's characterization
Anthropic suspends access to its latest models Fable 5 and Mythos 5 for foreign nationals after a U.S. government directive.
- Directive requires blocking the models for all foreign nationals, including Anthropic’s foreign employees.
- Action follows Anthropic’s announced partnership with Tata Consultancy Services to expand in India.
- Reports cite Amazon CEO Andy Jassy as the initial security reporter; Anthropic disputes the government’s characterization.
- Development sparks debate in India about building domestic AI capabilities versus relying on U.S. providers.
According to reports, the White House suspects a China‑linked group had access to Anthropic models such as Mythos (and Fable).
- Semafor cites US government sources alleging access by a China‑linked group
- Targets named are Mythos 5 and Fable 5; access would pose national‑security risks and enable model reverse‑engineering via distillation
- The White House has not confirmed the report and Anthropic has not publicly fully addressed the specific China claim
- Earlier accounts say Mythos was briefly accessible via a Discord group before Anthropic cut access