Creator
xAI
Released
2025-09-19
Intelligence
16.5
Artificial Analysis Index
Coding
—
Artificial Analysis Index
In $/1M
$0.20
input tokens
Out $/1M
$0.50
output tokens
Blended $/1M
$0.28
3:1 blended
Speed
0
tokens / sec
Profile
License, openness, and modality — the governance layer.
License
Proprietary
non-commercial
Weights
Closed
API only
Modalities
Image · Text
Parameters
—
Grok 4 Fast is a high-speed variant of Grok-4, optimized for faster inference while maintaining strong reasoning capabilities. It offers improved throughput and lower latency compared to the standard Grok-4 model.
Capability profile
Category strength across 20 domains, via LLM Stats.
biology
90physics
90chemistry
90factuality
90code
80math
70
general
70reasoning
70agents
40search
40vision
20
Benchmark breakdown
Independent evaluation scores, normalized to 0–100.
GPQA Diamond
61
Humanity’s Last Exam
5
MMLU-Pro
73
SciCode
33
LiveCodeBench
40
MATH-500—
AIME 2025
41
τ²-Bench (agentic)
64
Terminal-Bench Hard
12
IFBench
38