AlertClaude
Fable 5 and Mythos 5: pulled by US government order
On 12 June 2026, three days after releasing it, Anthropic disabled Claude Fable 5 — together with the research model Mythos 5 — for every user worldwide. It acted to comply with an export-control directive issued that afternoon by the US Commerce Department on national-security grounds. Existing Fable 5 sessions and any new requests now return an error. The established Claude models — Opus 4.8, Sonnet 4.6 and Haiku 4.5 — are unaffected and remain available.
Anthropic says it disagrees with the order, which it traces to "the finding of a narrow potential jailbreak", and that this should not "be cause for recalling a commercial model deployed to hundreds of millions of people". It has pledged to work towards restoring access, but has given no date.
For our readers, two things follow. The retention concern we flagged on 11 June is, for the moment, academic: Fable 5 cannot be used, so nothing can be put into it. And our framework — assessed against the established models — is unaffected and stands. If you moved confidential work onto Opus, Sonnet or Haiku on our earlier note, stay there: they remain available, and zero retention on the API and Enterprise is intact.
- Access to Fable 5 and Mythos 5 (statement, 12 June 2026) — Anthropiclive sourcePerma.cc recordas at 13 June 2026
- Anthropic disables access to Fable 5 and Mythos 5 to comply with government directive — CNBClive sourcePerma.cc recordas at 13 June 2026