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Grok 4 Fast (Reasoning)

xAI

ReasoningVision ModelProprietary

Analysis of xAI's Grok 4 Fast (Reasoning) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.

Context

Release Date
Sep 19, 2025
Window
2M

PricingPer 1M tokens

Input
$0.2
Output
$0.5
Blended 3:1
$0.275

Capabilities

Input
Output
Reasoning tokens

Benchmarks

Reasoning
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Math
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Coding
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MMLU Pro
85.0%
GPQA
84.7%
HLE
17.0%
SciCode
44.2%
AIME
89.7%
LiveCodeBench
83.2%

Analysis of xAI's Grok 4 Fast (Reasoning) and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more.