Grok 4 Fast (Non-reasoning)
xAIGrokProprietary
Description
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.
Release Date
2025-09-19
Parameters
—
Context Length
2.0M
Modalities
file, image, text
Capability Radar
35
general
28
coding
45
reasoning
40
scienceest.
40
agents
80
multimodal
Science uses a reasoning proxy when dedicated science benchmarks are unavailable.
Rankings
| Domain | #Rank | Score | Source |
|---|---|---|---|
| Agents & Tools | 83 | 45.0 | LS |
| Code Ranking | 261 | 31.0 | AA |
| General Ranking | 210 | 49.0 | AA |
| Math Reasoning | 215 | 42.0 | AA |
| Science | 257 | 42.0 | AA |
Benchmark Scores (LLM Stats)
Agents
BrowseComp
44.9%SR
Biology
GPQA
85.7%SR
Code
LiveCodeBench
80.0%SR
Factuality
SimpleQA
95.0%SR
Math
HMMT 2025
93.3%SR
AIME 2025
92.0%SR
Humanity's Last Exam
20.0%SR
AA Evaluation Indices
Math Index41.3
Intelligence Index23.1
Coding Index19.0
Mmlu Pro0.7
Tau20.6
Gpqa0.6
Aime 250.4
Livecodebench0.4
Ifbench0.4
Scicode0.3
Lcr0.2
Terminalbench Hard0.1
Hle0.1
LLM Stats Category Scores
Biology90
Chemistry90
Factuality90
General90
Physics90
Code80
Math70
Reasoning70
Agents40
Search40
Vision20
Pricing
Input Price$0.2 / 1M tokens
Output Price$0.5 / 1M tokens
Blended Price (3:1)$0.275 / 1M tokens
Speed
Tokens/sec48.7 tokens/s
Time to First Token0.38s
Time to Answer0.38s
Available Providers
(LS internal units)| Provider | Input Price | Output Price |
|---|---|---|
| xAI | 200K | 500K |