BREAKING
Anthropic Splits One Model In Two
Fable 5 vs Mythos 5
Claude Fable 5
Public
●
Reinforced safety classifiers
●
On API, Bedrock, Vertex AI
●
Falls back to Opus 4.8
Claude Mythos 5
Restricted
●
Guardrails partly loosened
●
Vetted cyber defense only
●
Via Project Glasswing
SWE-Bench Pro Jumps To 80.3%
Fable 5 Pro
80.3
Opus 4.8 Pro
69.2
SWE Verified
95
0
M
Context tokens
0
$
Input /1M
0
$
Output /1M
Praise Meets Pushback
One Brain, One Safety Switch
AI NEWS BLITZ
Anthropic just unveiled two Claude models built on the same Mythos-class brain.