BREAKING
Anthropic Ships Claude Fable 5
SWE-Bench Pro Scores
Fable 5
80.3
Opus 4.8
69.2
GPT-5.5
58.6
0
M
lines migrated
0
day
time taken
0
PR findings
Strengths and Trade-offs
Strengths
●
Whole-repo code review
●
1M-token context
●
Long autonomous sessions
Concerns
●
32.8% review precision
●
Nitpick noise
●
Safety fallbacks
0
$
per M input
0
$
per M output
0
%
guardrail rate
Cost Versus Benefit in Focus
AI NEWS BLITZ
Anthropic has launched Claude Fable 5, its new top-tier Mythos coding model.