Trump Drops Restrictions on Anthropic's Mythos and Fable Models

What happened

The US Department of Commerce lifted export-control restrictions on Anthropic's Claude Fable 5 and Mythos 5 models. Full global access for all commercial customers was restored on July 1, 2026, after an 18-day restriction period.

Context and impact

The restriction was imposed on June 12, 2026 after Amazon researchers discovered a jailbreak allowing the model to identify software vulnerabilities and generate exploit code. Anthropic deployed a new automated cybersecurity classifier. Commerce Secretary Howard Lutnick confirmed withdrawal of the license requirement. The earlier June 26 release covered only select trusted partners; this is the full global restoration.

Details

• Restriction lasted 18 days (June 12 – July 1, 2026)
• Trigger: jailbreak discovered by Amazon researchers enabling exploit code generation
• Fix: new automated cybersecurity classifier deployed by Anthropic
• Secretary Lutnick personally confirmed withdrawal of license requirement
• Global commercial access restored across all channels and for all customers