BREAKING
US Halts Anthropic Fable 5, Mythos 5
How the halt unfolded
1
Commerce letter to Amodei
↓
2
Halt foreign access
↓
3
Anthropic disables both
Fable 5 vs Mythos 5
Claude Fable 5
Public
●
Paid/enterprise API
●
First Mythos-class
●
Long-horizon agentic
Claude Mythos 5
Limited
●
Project Glasswing only
●
Some classifiers removed
●
Limited version
Fable 5 leads engineer benchmark
Fable 5
91
Opus 4.8
63
GPT-5.5
62
Jailbreak claim sparks dispute
Regulation meets frontier AI
AI NEWS BLITZ
Breaking news: the US Commerce Department imposed export controls on two Anthropic models.