Grok 4.1 Fast

Nov 2025
Retired 2026-05-15Replace withGrok 4.3Newer versionGPT-5.6 LunaBetterMiMo v2.6 ProOpen weights
Grok 4.1 Fast
Compare in
on
—per task?
not available via APIprice
—output speed?
2Mcontext

Rankingin thinking mode?

Retired models are left out of the current rankings.

Alternatives?

ModelScoreCostPer taskWhat changes
BetterGPT-5.6 Lunamedium+23%—$0.016Context: 2M → 1.05MOpenMiMo v2.6 Prothinking×2.3—$0.13Context: 2M → 1M+4BetterGPT-6 Lunamedium+47%—$0.017Context: 2M → 1.05M+4BetterClaude Haiku 5.5low+45%—$0.024Context: 2M → 1M+6BetterMiMo v2.5 ProthinkingOpen+28%—$0.054Context: 2M → 1M+1

History

2 versions
181920Oct 25Release dateAA Intelligence Index 4.3.244.1
181920Oct 25Release dateAA Intelligence Index 4.3.244.1

Benchmarks

all categories
Chat & Knowledge
Humanity's Last Exam19.3
Arena Text · overall1,430
AA Omniscience Index-29.9
CritPt (physics)2.9
AA Intelligence Index 4.3.2≈20.4
AA Omniscience · Accuracy25.1
AA Omniscience · Hallucination Rate73.4
AA-LCR (long context) 1.174
MathArena · ArXivMath · December 202550
MathArena · ArXivMath · February 202632
MathArena · ArXivMath · January 202653.3
MathArena · Project Euler45.3
MathArena · Kangaroo 2025 1-260.4
MathArena · Kangaroo 2025 11-1281.7
MathArena · Kangaroo 2025 3-439.6
MathArena · Kangaroo 2025 5-665.8
MathArena · Kangaroo 2025 7-879.2
MathArena · Kangaroo 2025 9-1087.5
MathArena · SMT 202584.6
MathArena · Apex5.2
MathArena · Apex Shortlist57.9
MathArena · BRUMO 202597.5
MathArena · CMIMC 202584.4
Vals LegalBench82.5
Vals MedCode28.1
Vals MedScribe78.7
MMLU-Pro · official boardlab84.2
GPQA Diamond85.3
AIME 2025 · AA archived89.3
MathArena · AIME 202694.2
MathArena · HMMT February 202686.4
MathArena · AIME 202589.2
MathArena · HMMT February 202590
MathArena · HMMT November 202593.3
Coding
WebDev Arena1,242
Terminal-Bench Hard (version unstated)24.2
WebDev Arena · full cohort1,242
LiveCodeBench · AA archived82.2
Agents & Tool Use
τ²-bench · AA93.3
Writing & Language
Arena Text · creative writing1,415
IFBench (instructions)52.7
Vision & Documents
MMMU-Pro (vision)63.3
Arena Vision · overall1,201.2

FAQ

How much does Grok 4.1 Fast cost?›

There is no per-unit API price: not available via API.

Is Grok 4.1 Fast free to use?›

There is no free API.

What is the context window of Grok 4.1 Fast?›

2M tokens.

When was Grok 4.1 Fast released? Is there a newer version?›

Released 2025-11-19. It has been superseded by Grok 4.3.

Is Grok 4.1 Fast open source?›

No, Grok 4.1 Fast is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.

Can Grok 4.1 Fast read images?›

It accepts text and images, PDF files as input.

What is Grok 4.1 Fast?›

Grok 4.1 Fast is a closed language model from xAI, released Nov 2025.

What are the best alternatives to Grok 4.1 Fast?›

GPT-5.6 Luna (better), MiMo v2.6 Pro (open weights).