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Grok 4 Fast (Non-Reasoning)

Grok 4 Fast (Non-Reasoning) is a model from SpaceXAI, released September 19, 2025.

Release Date: Sep 19, 2025

Developer SpaceXAI  🇺🇸
Context Window 2M
Max Output Tokens 2M
Token Costs (in/out) $0.20/0.50
Weights Private
Input Modalities

Accuracy

58.56 %

Avg. Cost (In/Out)

$ 0.20 / $ 0.50

Latency

6.48 s

Vals Index
BenchmarksAccuracyRankings
MedCode

30.04%

±1.97
97/107
MedScribe

79.72%

±1.87
61/109
MortgageTax

25.32%

±0.87
96/98
TaxEval v2

71.58%

±0.78
78/145
GPQA Diamond

62.12%

±2.43
110/138
LiveCodeBench

46.09%

±1.15
121/143
LegalBench

78.40%

±0.47
104/151
MMLU Pro

70.34%

±0.43
120/138
MMMU Pro

63.41%

±1.16
80/93
Proprietary BenchmarksAcademic BenchmarksIndustry Partners
Vals
Default Provider : SpaceXAI
Temperature: 0.7
Top P: 0.95
Top K: Default
Max Output Tokens: 2,000,000