Claude Fable 5

Release Date: 6/9/2026

Vals Index

Accuracy (Vals Index)

75.14% ± 0.64

Latency (Vals Index)

1050.68s

Cost/Test (Vals Index)

$5.16

Context Window

1M

Max Output Tokens

128k

Input Modality

Hyperparameter settings
Default Provider : Anthropic

Temperature

1

Top P

Default

Top K

Default

Max Output Tokens

128,000

Compute Effort

max

Benchmarks

Accuracy

Rankings

0.0%

± 0.64
1/ 25

0.0%

± 0.57
1/ 20

0.0%

± 0.88
1/ 111

0.0%

± 0.84
2/ 25

0.0%

± 2.20
2/ 63

0.0%

± 1.95
1/ 62

0.0%

± 0.91
5/ 79

0.0%

± 4.23
1/ 36

0.0%

± 3.40
5/ 60

0.0%

± 1.17
1/ 13

0.0%

± 0.82
3/ 117

0.0%

± 2.10
1/ 56

0.0%

± 1.94
2/ 111

0.0%

± 9.36
1/ 55

0.0%

± 0.89
1/ 116

0.0%

± 0.33
1/ 114

0.0%

± 0.28
1/ 110

0.0%

± 0.74
1/ 75

0.0%

± 0.98
1/ 54

0.0%

± 1.35
1/ 25
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