Claude Opus 4.8

Release Date: 5/28/2026

Vals Index

Accuracy (Vals Index)

70.17% ± 0.91

Latency (Vals Index)

1239.01s

Cost/Test (Vals Index)

$2.60

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%

± 0.91
1/ 20

0.0%

± 0.75
1/ 16

0.0%

± 0.93
8/ 108

0.0%

± 0.16
2/ 20

0.0%

± 2.17
5/ 60

0.0%

± 1.93
6/ 60

0.0%

± 0.89
2/ 76

0.0%

± 4.65
1/ 33

0.0%

± 3.35
3/ 57

0.0%

± 0.84
7/ 114

0.0%

± 3.08
1/ 47

0.0%

± 1.98
4/ 108

0.0%

± 0.95
3/ 113

0.0%

± 0.47
27/ 111

0.0%

± 0.30
4/ 107

0.0%

± 0.82
9/ 73

0.0%

± 1.42
1/ 50

0.0%

± 0.65
3/ 16
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