Grok 4 Fast (Reasoning)

Release Date: 9/19/2025

Vals Index

Accuracy (Vals Index)

42.64% ± 1.77

Latency (Vals Index)

416.19s

Cost/Test (Vals Index)

$0.06

Context Window

2M

Max Output Tokens

2M

Input Modality

Hyperparameter settings
Default Provider : xAI

Temperature

0.7

Top P

0.95

Top K

Default

Max Output Tokens

2,000,000

Benchmarks

Accuracy

Rankings

0.0%

± 1.77
30/ 34

0.0%

± 1.23
27/ 28

0.0%

± 0.43
10/ 54

0.0%

± 0.93
6/ 104

0.0%

± 2.84
35/ 51

0.0%

± 1.94
34/ 56

0.0%

± 2.14
16/ 56

0.0%

± 0.95
66/ 73

0.0%

± 3.04
47/ 54

0.0%

± 0.76
6/ 110

0.0%

± 0.00
42/ 42

0.0%

± 1.03
25/ 96

0.0%

± 1.79
22/ 104

0.0%

± 4.39
24/ 52

0.0%

± 1.10
45/ 109

0.0%

± 0.45
48/ 106

0.0%

± 0.25
36/ 95

0.0%

± 0.39
62/ 103

0.0%

± 1.07
39/ 70

0.0%

± 2.23
43/ 47

0.0%

± 4.85
41/ 60
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