GPT 5.5

Release Date: 4/23/2026

Vals Index

Accuracy (Vals Index)

68.82% ± 1.78

Latency (Vals Index)

367.02s

Cost/Test (Vals Index)

$1.39

Context Window

400k

Max Output Tokens

128k

Input Modality

Hyperparameter settings
Default Provider : OpenAI

Temperature

Default

Top P

Default

Top K

Default

Max Output Tokens

128,000

Reasoning Effort

xhigh

Benchmarks

Accuracy

Rankings

0.0%

± 1.78
2/ 45

0.0%

± 1.35
2/ 30

0.0%

± 0.32
6/ 50

0.0%

± 0.92
1/ 100

0.0%

± 2.83
6/ 49

0.0%

± 2.19
12/ 54

0.0%

± 1.93
2/ 54

0.0%

± 0.91
5/ 72

0.0%

± 5.03
3/ 28

0.0%

± 3.95
6/ 51

0.0%

± 0.85
10/ 107

0.0%

± 4.54
2/ 40

0.0%

± 1.29
2/ 102

0.0%

± 1.02
14/ 108

0.0%

± 0.41
4/ 119

0.0%

± 0.32
6/ 101

0.0%

± 0.77
1/ 69

0.0%

± 1.70
1/ 44

0.0%

± 5.15
4/ 56
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