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)

$11.00

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

Show scores with fallbacks counted as failures

Benchmarks

Accuracy

Rankings

0.0%

± 0.64
1/ 40

0.0%

± 0.57
1/ 29

0.0%

± 4.61
2/ 33

0.0%

± 0.88
2/ 126

0.0%

± 2.47
1/ 28

0.0%

± 0.84
4/ 40

0.0%

± 3.48
2/ 27

0.0%

± 2.20
3/ 76

0.0%

± 1.95
3/ 75

0.0%

± 0.91
7/ 90

0.0%

± 4.23
3/ 53

0.0%

± 3.40
7/ 71

0.0%

± 1.19
2/ 23

0.0%

± 0.82
4/ 132

0.0%

± 2.10
1/ 76

0.0%

± 2.17
3/ 27

0.0%

± 1.94
5/ 126

0.0%

± 9.36
4/ 60

0.0%

± 0.89
1/ 131

0.0%

± 0.33
1/ 129

0.0%

± 0.28
2/ 125

0.0%

± 0.74
2/ 86

0.0%

± 0.99
2/ 34

0.0%

± 0.98
3/ 75

0.0%

± 1.35
4/ 45
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