Noometry

xAI, proprietary

Grok 4.1 Fast

Grok 4.1 Fast by xAI ranks 136th of 354 ranked models on the Noometry Index as of October 2026, with a score of 41.4. Its strongest category is agentic & tool use, where it ranks 39th. API pricing starts at $0.20 per million input tokens and $0.50 per million output tokens, with a 128K-token context window.

Last verified

Noometry rank
#136 of 354
Index score
41.4
Evidence
Confirmed 32 results
Provider
xAI
Released
June 27, 2025
Weights
Proprietary
Reasoning
No
Context window
128K
Max output
30K
Input price
$0.20 / M
Output price
$0.50 / M
Blended price
$0.28 / M
Output speed
Not measured
Value
#50 of 219
Knowledge cutoff
Unknown
Input
text, image

Category scores

Each category score combines every public result we have in that category.

  1. Coding 34.1
  2. Agentic & Tool Use 36.3
  3. Reasoning 43.4
  4. Math 31.9
  5. Knowledge 33.1
  6. Multimodal 37.0
  7. Multilingual 51.0
  8. Instruction Following 72.7
  9. Long Context 42.4
  10. Writing & Preference 57.2
CategoryScoreRankResults
Coding34.1#2452
Agentic & Tool Use36.3#392
Reasoning43.4#494
Math31.9#2213
Knowledge33.1#2072
Multimodal37.0#761
Multilingual51.0#1141
Instruction Following72.7#1331
Long Context42.4#1261
Writing & Preference57.2#1314

Strengths and weaknesses

Categories where Grok 4.1 Fast places highest and lowest among the models ranked in each, with its score against that category's median.

Strongest categories

CategoryScorevs medianRank
Reasoning43.4+19.8#49 of 350, top 15%
Agentic & Tool Use36.3+6.0#39 of 154, top 26%
Multilingual51.0+3.5#114 of 297, top 39%

Weakest categories

CategoryScorevs medianRank
Coding34.1−4.6#245 of 340, top 73%
Math31.9−4.6#221 of 327, top 68%
Knowledge33.1−4.2#207 of 314, top 66%

Closest competitors

The models ranked just above and below Grok 4.1 Fast. When scores are this close, price and speed are often the better way to choose.

ModelRankScoreBlended $/MSpeed
o4-mini#13241.6$1.936Compare
Gemini 3.5 Flash Lite#13341.5$0.85—Compare
Grok 4.1#13441.5——Compare
GLM-4.6#13541.4$112Compare
GLM-4.6V#13741.3$0.45—Compare
MiMo-V2-Flash#13841.3$0.18—Compare
Hunyuan Turbos 20250226#13941.3——Compare
Kimi K2 (Jul 2025)#14041.2$1201Compare

Sponsored placements are available on pages like this one. Advertise on Noometry

Benchmark results

Every published result we track, with its source. Bold rows are the ones used for ranking; where several exist we prefer independent runs over self-reported numbers.

Coding

BenchmarkScorePositionSettingSourceDate
LMArena WebDev1242#104 of 113, top 93%LMArena2026-10-08
LMArena Coding1411#128 of 294, top 44%LMArena2026-10-08
ALE-Bench394.93#91 of 105, top 87%Epoch AI

Agentic & Tool Use

BenchmarkScorePositionSettingSourceDate
Berkeley Function Calling Leaderboard69.6%#5 of 49, top 11%fcBerkeley Function Calling Leaderboard
Berkeley Function Calling Leaderboard58.3%fcBerkeley Function Calling Leaderboard
τ²-bench Banking13.1%#24 of 26, top 93%highτ²-bench2026-05-05
LMArena Search1171#20 of 32, top 63%LMArena2026-08-24
Vending-Bench 21,107#46 of 60, top 77%Epoch AI

Reasoning

BenchmarkScorePositionSettingSourceDate
SimpleBench56%#32 of 77, top 42%Epoch AI
SimpleBench56%#32 of 77, top 42%Epoch AI
NYT Connections (extended)87.4%#25 of 91, top 28%Lech Mazur benchmarks
NYT Connections (extended)12.3%Lech Mazur benchmarks
LMArena Hard Prompts1407#121 of 297, top 41%LMArena2026-10-08
DTBench87.7%#48 of 151, top 32%Epoch AI
ForecastBench61#20 of 72, top 28%Epoch AI

Math

BenchmarkScorePositionSettingSourceDate
MathArena Final-Answer Competitions60.9%#22 of 29, top 76%reasoningMathArena
ProofBench4%#70 of 77, top 91%Epoch AI
LMArena Math1408#115 of 285, top 41%LMArena2026-10-08

Knowledge

BenchmarkScorePositionSettingSourceDate
Vectara Hallucination Rate (lower is better)17.8%#87 of 96, top 91%Vectara Hallucination Leaderboard
Vectara Hallucination Rate (lower is better)19.2%Vectara Hallucination Leaderboard
LMArena Expert1399#122 of 273, top 45%LMArena2026-10-08

Multimodal

BenchmarkScorePositionSettingSourceDate
LMArena Vision1201#78 of 122, top 64%LMArena2026-10-09

Multilingual

BenchmarkScorePositionSettingSourceDate
LMArena Non-English1391#114 of 297, top 39%LMArena2026-10-08
LMArena Chinese1441#111 of 285, top 39%LMArena2026-10-08
LMArena French1415#106 of 223, top 48%LMArena2026-10-08
LMArena German1404#93 of 231, top 41%LMArena2026-10-08
LMArena Japanese1349#97 of 211, top 46%LMArena2026-10-08
LMArena Korean1361#92 of 213, top 44%LMArena2026-10-08
LMArena Russian1387#121 of 283, top 43%LMArena2026-10-08
LMArena Spanish1413#99 of 226, top 44%LMArena2026-10-08

Instruction Following

BenchmarkScorePositionSettingSourceDate
LMArena Instruction Following1376#127 of 298, top 43%LMArena2026-10-08

Long Context

BenchmarkScorePositionSettingSourceDate
LMArena Longer Query1390#127 of 291, top 44%LMArena2026-10-08

Writing & Preference

BenchmarkScorePositionSettingSourceDate
LMArena Text1408#112 of 297, top 38%LMArena2026-10-08
LMArena Creative Writing1394#88 of 295, top 30%LMArena2026-10-08
EQ-Bench Creative Writing1327#76 of 115, top 67%EQ-Bench
LMArena Multi-Turn1389#129 of 295, top 44%LMArena2026-10-08

API pricing by provider

RouteInput $/MOutput $/MCached input $/MChecked
azure$0.20$0.50$0.052026-10-10
vertex$0.20$0.50$0.052026-10-10

All xAI API prices → Estimate your cost →

Compare Grok 4.1 Fast

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Frequently asked questions

How good is Grok 4.1 Fast?

Grok 4.1 Fast by xAI ranks 136th of 354 ranked models on the Noometry Index as of October 2026, with a score of 41.4. Its strongest category is agentic & tool use, where it ranks 39th. API pricing starts at $0.20 per million input tokens and $0.50 per million output tokens, with a 128K-token context window.

How much does Grok 4.1 Fast cost?

Grok 4.1 Fast costs $0.20 per million input tokens and $0.50 per million output tokens on vertex, with cached input at $0.05.

What is Grok 4.1 Fast's context window?

Grok 4.1 Fast accepts up to 128K tokens of input and can write up to 30K tokens in one response.

Is Grok 4.1 Fast open source?

No. Grok 4.1 Fast is proprietary and available only through xAI's API and partner platforms.

What are Grok 4.1 Fast's strengths and weaknesses?

Relative to other ranked models, Grok 4.1 Fast places best in reasoning, agentic & tool use, multilingual and lowest in coding, math, knowledge.

What is Grok 4.1 Fast best at?

Its best category is agentic & tool use, where it ranks 39th on Noometry.