BREAKING
US Halts Fable 5, Mythos 5 Access
Released, then shut down in days
1
Jun 9 launch
↓
2
Export directive
↓
3
Access cut off
Two models, one base
Mythos 5
Glasswing
●
Frontier Mythos-class
●
Cyber defense use
●
Government partners
Fable 5
General
●
Same base model
●
Stronger guardrails
●
Public release
Fable 5 leads SWE-Bench Pro
Fable 5
80.3
Opus 4.8
69.2
GPT-5.5
58.6
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Anthropic calls it a misunderstanding
AI NEWS BLITZ
Anthropic abruptly cut off access to two new Claude models under US export controls.