TAU2
Measured Jul 10, 2026Source
Score
0.66
Models14 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 Jul 10, 2026Source
Score
0.19
Lcr
Measured Jul 10, 2026Source
Score
0.65
Ifbench
Measured Jul 10, 2026Source
Score
0.51
Aime 25
Measured Jul 10, 2026Source
Score
0.9
Scicode
Measured Jul 10, 2026Source
Score
0.44
Livecodebench
Measured Jul 10, 2026Source
Score
0.83
Hle
Measured Jul 10, 2026Source
Score
0.17
Gpqa
Measured Jul 10, 2026Source
Score
0.85
Mmlu Pro
Measured Jul 10, 2026Source
Score
0.85
Artificial Analysis Math Index
Measured Jul 10, 2026Source
Score
89.7
Artificial Analysis Intelligence Index
Measured Jul 10, 2026Source
Score
27.4
Aime
Measured Jul 10, 2026Source
Score
0.94
Math 500
Measured Jul 10, 2026Source
Score
0.99
Plan availability
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