Claude Opus 4.8

Release Date: 5/28/2026

Vals Index

Accuracy (Vals Index)

70.36% ± 0.90

Latency (Vals Index)

1330.50s

Cost/Test (Vals Index)

$2.90

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%

± 0.90
2/ 27

0.0%

± 0.74
2/ 21

0.0%

± 0.93
10/ 113

0.0%

± 0.16
3/ 27

0.0%

± 2.17
6/ 65

0.0%

± 1.93
8/ 64

0.0%

± 0.89
2/ 80

0.0%

± 4.65
2/ 39

0.0%

± 3.35
3/ 61

0.0%

± 1.26
2/ 13

0.0%

± 0.84
8/ 119

0.0%

± 3.08
2/ 59

0.0%

± 1.98
6/ 113

0.0%

± 0.95
4/ 118

0.0%

± 0.47
29/ 116

0.0%

± 0.30
5/ 112

0.0%

± 0.82
10/ 76

0.0%

± 0.70
1/ 20

0.0%

± 1.42
2/ 56

0.0%

± 0.65
4/ 27
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