Anthropic Restores Claude Fable 5 Globally After 18-Day Export-Control Suspension

Anthropic restored Claude Fable 5 worldwide on July 1, 2026, ending an 18-day global suspension. Mythos 5, however, was restored only for a set of US organizations, following the US government's approval on June 26 — it is not back globally. The arc is now three events in one month: Fable 5 launched June 9, was disabled June 12 under a US export-control directive, and was restored July 1. This article covers only the restoration — for the launch pricing and the disablement rationale, see our earlier coverage.

What triggered the suspension, in Anthropic's account. Anthropic said the June 12 shutdown followed a finding by Amazon researchers that a jailbreak technique could make Fable 5 identify software vulnerabilities in code — and, in at least one reported case, produce working exploit code. The US government treated this as an export-control matter and ordered access suspended for foreign nationals; because Anthropic could not reliably separate foreign nationals from its broader user base, it disabled both models for everyone.

The fix: a new safety classifier, with a stated block rate. Anthropic says it trained an improved safety classifier specifically to catch the jailbreak technique that triggered the suspension. Anthropic states the classifier blocks the technique in over 99% of cases — this is Anthropic's own claim, not an independently verified figure, and operators should treat it as a vendor-reported benchmark rather than an audited result. When the classifier blocks a request, it falls back to Claude Opus 4.8, the same fallback pattern Fable 5 used at launch for its original hard-blocked domains.

Where it's live — and where it isn't yet. As of July 1, Fable 5 is restored on Claude.ai, the Claude Platform, Claude Code, and Claude Cowork. Cloud-platform availability is explicitly "to follow": Amazon Bedrock, Google Cloud's Vertex AI, and Microsoft Foundry are not yet back online with Fable 5 as of this restoration. Teams running Fable 5 through any of those three cloud integrations should not assume access has returned — check your specific platform's status before resuming production traffic there.

A short included-usage window, then credits. For Pro, Max, Team, and select Enterprise plans, Fable 5 is included for up to 50% of weekly usage limits through July 7, 2026. After that date, usage beyond what's included requires usage credits, the same mechanism flagged at the original June 9 launch. This is a time-bound allowance, not a permanent entitlement — plan credit provisioning before July 7 rather than after.

What this means for evaluators and Claude Code users. Frontier-model evaluators now have a Fable 5 that has been through one real-world jailbreak-and-patch cycle — worth factoring into any capability-versus-safety comparison against Opus 4.8. Claude Code users who had switched agentic workflows to claude-fable-5 before the suspension can resume on the first-party surfaces listed above; those still routing through Bedrock, Vertex AI, or Foundry remain on Opus 4.8 or another model until Anthropic confirms cloud-platform restoration separately.