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
3/ 36

0.0%

± 0.74
3/ 27

0.0%

± 4.18
3/ 29

0.0%

± 0.93
13/ 122

0.0%

± 5.16
12/ 15

0.0%

± 2.61
2/ 22

0.0%

± 0.16
5/ 36

0.0%

± 3.45
2/ 21

0.0%

± 2.17
6/ 72

0.0%

± 1.93
10/ 71

0.0%

± 0.89
3/ 86

0.0%

± 4.65
4/ 48

0.0%

± 3.35
3/ 67

0.0%

± 1.21
1/ 17

0.0%

± 0.84
11/ 128

0.0%

± 3.08
2/ 72

0.0%

± 2.15
4/ 22

0.0%

± 1.98
8/ 122

0.0%

± 0.95
4/ 127

0.0%

± 0.47
36/ 125

0.0%

± 0.30
5/ 121

0.0%

± 0.82
12/ 82

0.0%

± 0.70
3/ 30

0.0%

± 4.50
3/ 12

0.0%

± 1.42
4/ 70

0.0%

± 0.65
8/ 41
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