TAU2
Measured May 29, 2026Source
Score
0.66
Models15 0 
Grok 4 Fast (Reasoning)
xAIxAIUnited States
Grok 4 Fast (Reasoning) is a lightweight, high-speed reasoning model from xAI's Grok 4 series. It is optimized for rapid inference and response generation, making it suitable for applications requiring quick, logical outputs.
ReasoningFastCodingMultimodal
Input / 1M tokens
$0.20Output / 1M tokens
$0.50Output tokens/s
77.55First-token seconds
5.46sSupported plans
0Benchmark history
Evaluations
Terminalbench Hard
Measured May 29, 2026Source
Score
0.19
Lcr
Measured May 29, 2026Source
Score
0.65
Ifbench
Measured May 29, 2026Source
Score
0.51
Aime 25
Measured May 29, 2026Source
Score
0.9
Scicode
Measured May 29, 2026Source
Score
0.44
Livecodebench
Measured May 29, 2026Source
Score
0.83
Hle
Measured May 29, 2026Source
Score
0.17
Gpqa
Measured May 29, 2026Source
Score
0.85
Mmlu Pro
Measured May 29, 2026Source
Score
0.85
Artificial Analysis Math Index
Measured May 29, 2026Source
Score
89.7
Artificial Analysis Coding Index
Measured May 29, 2026Source
Score
27.4
Artificial Analysis Intelligence Index
Measured May 29, 2026Source
Score
35.1
Aime
Measured May 29, 2026Source
Score
0.94
Math 500
Measured May 29, 2026Source
Score
0.99
Plan availability
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