Creator
xAI
Released
2025-09-19
Intelligence
27.4
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
—
Pushing the Frontier of Cost-Efficient Intelligence. Grok-4 Fast Reasoning is a high-speed variant of Grok-4 optimized for faster inference while maintaining strong reasoning capabilities through thinking tokens.
Benchmark breakdown
Independent evaluation scores, normalized to 0–100.
GPQA Diamond
85
Humanity’s Last Exam
17
MMLU-Pro
85
SciCode
44
LiveCodeBench
83
MATH-500—
AIME 2025
90
τ²-Bench (agentic)
66
Terminal-Bench Hard
19
IFBench
51
Providers
Inference hosts serving this model — their own pricing and measured performance, cheapest input first.
| Provider | In $/1M | Out $/1M | Throughput | Latency | Status |
|---|---|---|---|---|---|
| xAI | $0.20 | $0.50 | 90 | — | active |
All providers
1 host · via LLM Stats