Model comparison

Grok 4.1 Fast vs MiniMax-M2.1

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 38.9 on the Noometry Index.

Last verified October 12, 2026. 21 shared benchmarks.

Grok 4.1 Fast xAI

41.4

Rank #136 Confirmed

MiniMax-M2.1

MiniMax

38.9

Rank #178 Confirmed

Summary

They share 21 benchmarks with published results for both. Grok 4.1 Fast scores higher in 3 categories and MiniMax-M2.1 in 6 categories; 7 gaps are clear of the uncertainty.
The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 16.6.
The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 11.2% for MiniMax-M2.1.
Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.30 / $1.20 for MiniMax-M2.1.
MiniMax-M2.1 accepts more context: 205K tokens versus 128K.
MiniMax-M2.1 has downloadable open weights; the other is API-only.

Side by side

Grok 4.1 Fast and MiniMax-M2.1 specifications
	Grok 4.1 Fast	MiniMax-M2.1
Provider	xAI	MiniMax
Noometry Index	41.4	38.9
Released	2025-06-27	2025-12-23
Weights	Proprietary	Open
Context window	128K	205K
Max output	30K	131K
Input $ / M tokens	$0.20	$0.30
Output $ / M tokens	$0.50	$1.20
Results tracked	32	22

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Category by category

Coding MiniMax-M2.1 leads

Grok 4.1 Fast: 34.1 (#245), MiniMax-M2.1: 40.4 (#143)

Coding benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena WebDev	1242	1384
LMArena Coding	1411	1421
ALE-Bench	394.93	623.83

Agentic & Tool Use Grok 4.1 Fast leads

Grok 4.1 Fast: 36.3 (#39), MiniMax-M2.1: 27.9 (#98)

Agentic & Tool Use benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
Terminal-Bench	—	36.6%
Berkeley Function Calling Leaderboard	69.6%	—
τ²-bench Banking	13.1%	—
LMArena Search	1171	—
Vending-Bench 2	1,107	—

Reasoning Grok 4.1 Fast leads

Grok 4.1 Fast: 43.4 (#49), MiniMax-M2.1: 16.6 (#302)

Reasoning benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
NYT Connections (extended)	87.4%	11.2%
LMArena Hard Prompts	1407	1411
SimpleBench	56%	—
DTBench	87.7%	—
ForecastBench	61	—

Math MiniMax-M2.1 leads

Grok 4.1 Fast: 31.9 (#221), MiniMax-M2.1: 38.3 (#138)

Math benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena Math	1408	1397
MathArena Final-Answer Competitions	60.9%	—
ProofBench	4%	—

Knowledge MiniMax-M2.1 leads

Grok 4.1 Fast: 33.1 (#207), MiniMax-M2.1: 38.3 (#147)

Knowledge benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
Vectara Hallucination Rate	17.8%	11.8%
LMArena Expert	1399	1431

Multimodal Not comparable

Grok 4.1 Fast: 37.0 (#76), MiniMax-M2.1: —

Multimodal benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena Vision	1201	—

Multilingual Too close to call

Grok 4.1 Fast: 51.0 (#114), MiniMax-M2.1: 50.0 (#128)

Multilingual benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena Non-English	1391	1378
LMArena Chinese	1441	1430
LMArena French	1415	1404
LMArena German	1404	1381
LMArena Japanese	1349	1287
LMArena Korean	1361	1298
LMArena Russian	1387	1387
LMArena Spanish	1413	1397

Instruction Following MiniMax-M2.1 leads

Grok 4.1 Fast: 72.7 (#133), MiniMax-M2.1: 73.8 (#112)

Instruction Following benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena Instruction Following	1376	1400

Long Context Too close to call

Grok 4.1 Fast: 42.4 (#126), MiniMax-M2.1: 43.2 (#101)

Long Context benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena Longer Query	1390	1416

Writing & Preference MiniMax-M2.1 leads

Grok 4.1 Fast: 57.2 (#131), MiniMax-M2.1: 58.3 (#120)

Writing & Preference benchmarks
Benchmark	Grok 4.1 Fast	MiniMax-M2.1
LMArena Text	1408	1392
LMArena Creative Writing	1394	1361
LMArena Multi-Turn	1389	1396
EQ-Bench Creative Writing	1327	—

Frequently asked questions

Is Grok 4.1 Fast better than MiniMax-M2.1?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 38.9 on the Noometry Index.

Which is cheaper, Grok 4.1 Fast or MiniMax-M2.1?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; MiniMax-M2.1 lists at $0.30 and $1.20.

Is Grok 4.1 Fast or MiniMax-M2.1 better for coding?

MiniMax-M2.1 scores higher on coding benchmarks: 40.4 versus 34.1 in the Noometry coding category.

Which has the bigger context window?

MiniMax-M2.1 does, with 205K tokens against 128K.

How many benchmarks do Grok 4.1 Fast and MiniMax-M2.1 share?

21 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and MiniMax-M2.1 has 22.