Claude Fable 5: 18 Days Offline on Export Rules [2026]

Claude Fable 5, Anthropic's new frontier AI model released 9 June 2026, was blocked from export to multiple countries for 18 days following US regulatory review, then restored on 30 June with export controls in place. The model scores 80.3% on SWE-Bench Pro—21 points ahead of GPT-5.5—but its restricted sibling Claude Mythos 5 was withheld entirely from public release over cybersecurity concerns.

This Wire brief sits within Fusion42's coverage of AI Frontier Models. Wire is Fusion42's founder-focused intelligence feed: each story is connected to the funds and startups it names — every one with a live profile on Raise or Scout — so founders can follow the capital and the momentum behind the headline rather than just the headline itself. Wire analysis is one of the live surfaces Arthur, Fusion42's AI co-founder, reasons over.