Claude Fable 5
Closed
Claude Fable 5 is Anthropic's most capable widely released model, built for the most demanding reasoning and long-horizon agentic work. Shares its base model with the invitation-only Claude Mythos 5.
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Context
1M
Input
$10
/1M tok
Output
$50
/1M tok
Blended
$20
#433/ 441/1M · 3:1
Speed
59
#85/ 441tok/s
Cache read
$0.50
0.05x input
Cache write
$6.25
0.63x input
Price & speed via Artificial Analysis · ranked across tracked models · caching via OpenRouter
Reported on 36 evals across 20 domains - best 98.5% on τ²-bench (Tau²-bench) · #3 of 321
Reported eval scores
36LiveBench - Math93.9
IFBench63.5
Vals Index75.1
LiveBench81.4
SciCode60.2
GPQA Diamond92.6
Swebenchpro80.3
FrontierCode29.3