Anthropic said on July 1, 2026 that it had begun restoring Claude Fable 5 globally after the US Department of Commerce lifted export controls on both Fable 5 and Claude Mythos 5. The return follows a roughly 18-to-19-day suspension that had affected all users.
Jun 9 – Jul 1, 2026 · Anthropic
A US export order pulled Claude's frontier models offline for three weeks — now they're coming back
After Commerce cited national security and barred foreign access to Fable 5 and Mythos 5, Anthropic suspended both for all users. With controls fully lifted on June 30, Fable 5's global rollout began July 1 — with a stricter cyber-security classifier bolted on.
The three-week blackout — a timeline
JUN 9 · Launch
Fable 5 (general) & Mythos 5 (restricted) released as "Mythos-class" frontier models.
JUN 12 · Shut off
Commerce export order bars foreign access; APIs can't verify nationality, so access is cut for all users.
JUN 26 · Partial
Mythos 5 restoration approved for some US organizations.
JUN 30 – JUL 1 · Back
Controls fully lifted; Fable 5 rollout begins with a stricter cyber classifier.
Fable 5 vs Opus 4.8 — benchmark leap
Same metric, drawn to scale. Each column height is proportional to the score.
More than 2× the FrontierCode score of Opus 4.8 — a step-change in agentic coding.
1M
context tokens · up to 128K output
91/100
senior-engineer eval — beats Opus 4.8 & GPT-5.5
What developers praised
SOTA on CursorBench; handles long-horizon tasks once out of reach
"Slow, expensive, but churns through everything"
Near Mythos-5 performance with only tighter guardrails
Lingering concerns
Classifier false positives — benign requests rejected
High cost and slow speed; heavy token consumption
New stricter classifier may block even more cyber queries
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