BREAKING
Anthropic Halts Claude Fable 5 & Mythos 5
Launch to Halt in Three Days
1
Launch June 9
↓
2
US export order
↓
3
Access halted June 12
Two Tiers, One Foundation
Fable 5
Public
●
Safety classifiers on
●
Falls back to Opus 4.8
●
On API and major clouds
Mythos 5
Glasswing only
●
Some guardrails lifted
●
Cyber defense partners
●
Critical infrastructure
SWE-Bench Pro Coding Scores
Fable/Mythos 5
80.3
Opus 4.8
69.2
GPT-5.5
58.6
0
$
per 1M input
0
$
per 1M output
0
M
context window
Restoration Timeline Uncertain
AI NEWS BLITZ
Anthropic launched two powerful new Claude models, then suspended all access days later.