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Grok 4.1 Fast

Release Date 2025-11-19(Knowledge cutoff 2024-11)··2M IN · 30K OUTProprietary Model|Retired· 2026-05-15
Overall2.0Top 86%
AutomationNo data
Office1.5Top 92%
CodingNo data

Grok 4.1 Fast is xAI's agentic tool-calling model, optimized for real-world use cases such as customer support and deep research. It features a 2M-token context window — the largest among Western frontier models — and focuses on significantly reduced hallucination rates for information-seeking tasks. Reasoning can be enabled or disabled via the API's reasoning parameter, allowing developers to choose between speed-optimized direct answers and deeper analytical responses.

  1. 01ImagesGenerated images
  2. 02CostCost · Usage · Speed
  3. 03User CompareUser Comparisons
  4. 04Expert EvalExpert Performance Evaluation
  5. 05OpinionPublic Opinion
  6. 06Related Info

API cost

$0.2IN$0.5OUT
Calculate Cost

Output Speed

Fastper 2,000 tokens
First Output0.4s
total23.3s
87tok/s
First Output 0.4stotal: 23.3s
SourceArtificial AnalysisLast updatedSep 27, 2026

User Comparisons

Response Speed
Total 12.5s
Total 12.5s
78 tok/s
SourceAIB Inc.Last updatedApr 6, 2026

Expert Performance Evaluation

Overall performance

MoreAll overall performance AI rankings
11.3Reasoning effort: None74.3%

About AA Intelligence IndexMore about AA Intelligence Index

Automation (agents)

MoreAll automation AI rankings
QCan it handle customer service by the rules?TAU2·Bottom 21%#64
63.7%Reasoning effort: None

About TAU2More about TAU2

Documents and office work

MoreAll documents and office work AI rankings
31.3%Reasoning effort: None52.5%28.3%44.4%37.9%

About Long Context ReasoningMore about Long Context Reasoning

Research and fact-checking

MoreAll research and fact-checking AI rankings
17.8%82.2%56.7

About Vectara Hallucination RateMore about Vectara Hallucination Rate

Coding

MoreAll coding AI rankings
14.4%Reasoning effort: None19.539.9%29.6%

About TerminalBench HardMore about TerminalBench Hard

Writing and chat

MoreAll writing and chat AI rankings
36.5%Reasoning effort: None77.5%

About IFBenchMore about IFBench

Math and science

MoreAll math and science AI rankings
5.1%Reasoning effort: None63.7%34.334.3%56.0%

About Humanity's Last ExamMore about Humanity's Last Exam

Specialized fields

81.0%60.3%73.0%47.7%62.0%74.9%67.0%53.0%23.3%4.0%9.0%74.0%8.4%74.0%46.0%24.0%88.0%70.0%

About HAE-RAE Bench v1More about HAE-RAE Bench v1

See each evaluation’s detail page for its source and last update·Data sources & removal requests

Related Info

xAI
PrivateAI Native
xAI
🇺🇸 Palo Alto2023ARR $500M+$250B~2,000
Grok 4.7Grok 4.6Grok 4.5Grok Build 0.1Grok Imagine Image Quality