Breaking

US Commerce Dept Lifts Export Curbs on Claude Fable 5, Mythos 5

June 30, 2026 at 19:53 EDT

Foundation Models
Policy & Regulation
Security

Anthropic said it has received notice that the US Department of Commerce lifted its export controls on Claude Fable 5 and Claude Mythos 5, and that it will begin restoring access on July 1, 2026. The two models had been disabled worldwide for roughly three weeks.

June 30, 2026 · Anthropic

US Lifts Export Controls on Claude Fable 5 & Mythos 5 — Access to Be Restored

The Commerce Department has lifted the controls that forced both cutting-edge models offline worldwide. Anthropic will begin restoring access in phases starting July 1, ending a roughly three-week shutdown.

~3 wks

Worldwide shutdown duration before lifting

Models affected: Fable 5 & Mythos 5

~100

US firms & agencies given Mythos 5 in late June

Timeline of events

Jun 9

Both models released

Jun 12

Disabled worldwide under BIS directive

Late Jun

Mythos 5 partially released to US orgs

Jul 1

Phased restoration begins

Fable 5

Public version

Keeps Mythos 5's reasoning & long-horizon agentic capabilities, but adds strict safety classifiers for cyber and bio. Can fall back to other models when it refuses.

Mythos 5

Full-capability version

No safety classifiers. Limited to trusted partners via the Project Glasswing program — the focus of national-security concerns over jailbreak misuse.

Shared specifications

tokens context window

128K

max output tokens

Jan 2026

knowledge cutoff

Praise

Very powerful and capable of handling most tasks. Strong reasoning, high resistance to jailbreaks. Relief now spreads as restoration nears.

Criticism

Slow and expensive. Fable 5's guardrails called excessive, blocking legitimate cyber/bio queries. Foreign-researcher restrictions risk harming the wider industry.

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