Grok
Grok 4.1 Fast (Reasoning)
Model ID:grok-4-1-fast-reasoning
2025-09-15Proprietary Model
Grok SuperGrokGrok SuperGrok Heavy|API
OverallNo.19
PopularityNo.47
Knowledge Cutoff
2025-06-01
The date this AI finished learning. It may not know about things that happened after this date.
Input → Output Format
The types of content this AI can receive, and what it can produce in return.
Context Memory
256KIN33KOUT
The maximum amount of text the AI can read and process in a single request. A larger number means it can handle longer documents or conversations.
Cost/1M Words
$1IN$5OUT
The cost of using this AI directly in your own application. Shown in USD per 1 million units of text (tokens).
AI Performance Evaluation
Arena Overall Score
1431
±4As of 2026-04-02
Overall Rank
No.47
40,712 Votes
Arena by Ability
Hard Prompts
1442±5No.59
Expert Knowledge
1438±12No.64
Instruction Following
1400±6No.77
Conversation Memory
1415±8No.71
Creative
1410±8No.40
Coding
1463±7No.66
Math
1420±12No.57
Arena by Occupation
Creative Writing
1405±7No.56
Social Sciences
1450±8No.48
Media
1400±7No.45
Business
1417±7No.57
Healthcare
1446±12No.59
Legal
1426±12No.65
Software
1459±6No.55
Mathematics
1424±14No.60
Source:Arena Intelligence
Reasoning Ability
AA Intelligence Index
39%↑0%
MMLU-Pro
85%↑3%
GPQA Diamond
85%↑3%
HLE
18%↑1%
Math
AA Math Index
89%↑15%
AIME 2025
89%↑15%
Coding Ability
AA Coding Index
31%↓6%
LiveCodeBench
82%↑17%
SciCode
44%↑2%
TerminalBench
24%↓10%
Instruction Following
IFBench
53%↓5%
Long Context
AA-LCR
68%↑4%
Agentic AI Ability
TAU2
93%↑22%
Speed
Standard Mode
114tok/sec↑36
First Output 0.30s
Artificial Analysis
Reasoning Mode
131tok/sec↑58
First Output 6.80s
Artificial Analysis
Source:Artificial Analysis