BREAKING
Anthropic Disables Fable 5, Mythos 5
How the Shutdown Unfolded
1
Models launched
↓
2
Commerce directive June 12
↓
3
Global access disabled
↓
4
Talks begin June 15
Fable 5 vs Mythos 5
Fable 5
Public
●
Added cyber and biology classifiers
●
Strengthened guardrails
Mythos 5
Project Glasswing
●
Higher performance
●
Some guardrails relaxed
SWE-Bench Pro Scores
Fable/Mythos 5
80.3
Opus 4.8
69.2
GPT-5.5
58.6
0
M
context window
0
$
per M input
0
$
per M output
Outcome of Talks Unclear
AI NEWS BLITZ
Anthropic has cut off access to two new models to comply with a US government order.