BREAKING
Sonnet 5 executor, Fable 5 advisor
How the advisor/executor split works
1
Sonnet 5 runs routine work
↓
2
Escalate hard cases
↓
3
Fable 5 advises
Two models, two roles
Sonnet 5
executor
●
Sonnet class
●
1M token context
●
Default across all plans
Fable 5
advisor
●
Mythos top tier
●
Long-horizon tasks
●
Redeployed July 1
SWE-bench Pro scores
Sonnet 5
63.2
Opus 4.8
69.2
Fable 5
80.3
0
%
routine to Sonnet 5
0
K
old monthly bill
0
K
new monthly bill
Next: automatic role routing
AI NEWS BLITZ
Developers are pairing Claude Sonnet 5 with Fable 5 to slash token costs.