xAI, proprietary

# Grok 4.1 Fast

> Grok 4.1 Fast by xAI, released June 2025. Ranked #136 of 354 with a Noometry Index of 41.4. API: $0.20 in / $0.50 out per M tokens. 128K context. Scores, sources and comparisons.
- Canonical page: https://noometry.com/models/grok-4-1-fast
- Last updated: 2026-10-10
- Title: Grok 4.1 Fast Benchmarks, Price & Rank (October 2026)

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 October 10, 2026

## Specifications

- **Noometry rank:** #136 of 354
- **Index score:** 41.4
- **Evidence:** Confirmed 32 results
- **Provider:** [xAI](https://noometry.com/providers/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.

Grok 4.1 Fast category scores

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
11.  020406080

Grok 4.1 Fast category ranks
| Category | Score | Rank | Results |
| --- | --- | --- | --- |
| [Coding](https://noometry.com/best/coding) | 34.1 | #245 | 2 |
| [Agentic & Tool Use](https://noometry.com/best/agentic) | 36.3 | #39 | 2 |
| [Reasoning](https://noometry.com/best/reasoning) | 43.4 | #49 | 4 |
| [Math](https://noometry.com/best/math) | 31.9 | #221 | 3 |
| [Knowledge](https://noometry.com/best/knowledge) | 33.1 | #207 | 2 |
| [Multimodal](https://noometry.com/best/multimodal) | 37.0 | #76 | 1 |
| [Multilingual](https://noometry.com/best/multilingual) | 51.0 | #114 | 1 |
| [Instruction Following](https://noometry.com/best/instruction-following) | 72.7 | #133 | 1 |
| [Long Context](https://noometry.com/best/long-context) | 42.4 | #126 | 1 |
| [Writing & Preference](https://noometry.com/best/writing) | 57.2 | #131 | 4 |

## 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

Grok 4.1 Fast: strongest categories
| Category | Score | vs median | Rank |
| --- | --- | --- | --- |
| [Reasoning](https://noometry.com/best/reasoning) | 43.4 | +19.8 | #49 of 350, top 15% |
| [Agentic & Tool Use](https://noometry.com/best/agentic) | 36.3 | +6.0 | #39 of 154, top 26% |
| [Multilingual](https://noometry.com/best/multilingual) | 51.0 | +3.5 | #114 of 297, top 39% |

### Weakest categories

Grok 4.1 Fast: weakest categories
| Category | Score | vs median | Rank |
| --- | --- | --- | --- |
| [Coding](https://noometry.com/best/coding) | 34.1 | −4.6 | #245 of 340, top 73% |
| [Math](https://noometry.com/best/math) | 31.9 | −4.6 | #221 of 327, top 68% |
| [Knowledge](https://noometry.com/best/knowledge) | 33.1 | −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.

Models ranked closest to Grok 4.1 Fast
| Model | Rank | Score | Blended $/M | Speed |  |
| --- | --- | --- | --- | --- | --- |
| [o4-mini](https://noometry.com/models/o4-mini) | #132 | 41.6 | $1.93 | 6 | [Compare](https://noometry.com/compare/grok-4-1-fast-vs-o4-mini) |
| [Gemini 3.5 Flash Lite](https://noometry.com/models/gemini-3-5-flash-lite) | #133 | 41.5 | $0.85 | — | [Compare](https://noometry.com/compare/gemini-3-5-flash-lite-vs-grok-4-1-fast) |
| [Grok 4.1](https://noometry.com/models/grok-4-1) | #134 | 41.5 | — | — | [Compare](https://noometry.com/compare/grok-4-1-vs-grok-4-1-fast) |
| [GLM-4.6](https://noometry.com/models/glm-4-6) | #135 | 41.4 | $1 | 12 | [Compare](https://noometry.com/compare/glm-4-6-vs-grok-4-1-fast) |
| [GLM-4.6V](https://noometry.com/models/glm-4-6v) | #137 | 41.3 | $0.45 | — | [Compare](https://noometry.com/compare/glm-4-6v-vs-grok-4-1-fast) |
| [MiMo-V2-Flash](https://noometry.com/models/mimo-v2-flash) | #138 | 41.3 | $0.18 | — | [Compare](https://noometry.com/compare/grok-4-1-fast-vs-mimo-v2-flash) |
| [Hunyuan Turbos 20250226](https://noometry.com/models/hunyuan-turbos) | #139 | 41.3 | — | — | [Compare](https://noometry.com/compare/grok-4-1-fast-vs-hunyuan-turbos) |
| [Kimi K2 (Jul 2025)](https://noometry.com/models/kimi-k2) | #140 | 41.2 | $1 | 201 | [Compare](https://noometry.com/compare/grok-4-1-fast-vs-kimi-k2) |

Sponsored placements are available on pages like this one. [Advertise on Noometry](https://noometry.com/advertise)

## 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

Grok 4.1 Fast Coding benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [LMArena WebDev](https://noometry.com/benchmarks/arena-webdev) | 1242 | #104 of 113, top 93% |  | [LMArena](https://lmarena.ai/leaderboard/webdev) | 2026-10-08 |
| [LMArena Coding](https://noometry.com/benchmarks/arena-coding) | 1411 | #128 of 294, top 44% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [ALE-Bench](https://noometry.com/benchmarks/ale-bench) | 394.93 | #91 of 105, top 87% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |

### Agentic & Tool Use

Grok 4.1 Fast Agentic & Tool Use benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [Berkeley Function Calling Leaderboard](https://noometry.com/benchmarks/bfcl) | 69.6% | #5 of 49, top 11% | fc | [Berkeley Function Calling Leaderboard](https://gorilla.cs.berkeley.edu/leaderboard.html) |  |
| [Berkeley Function Calling Leaderboard](https://noometry.com/benchmarks/bfcl) | 58.3% |  | fc | [Berkeley Function Calling Leaderboard](https://gorilla.cs.berkeley.edu/leaderboard.html) |  |
| [τ²-bench Banking](https://noometry.com/benchmarks/tau2-banking) | 13.1% | #24 of 26, top 93% | high | [τ²-bench](https://taubench.com/) | 2026-05-05 |
| [LMArena Search](https://noometry.com/benchmarks/arena-search) | 1171 | #20 of 32, top 63% |  | [LMArena](https://lmarena.ai/leaderboard/search) | 2026-08-24 |
| [Vending-Bench 2](https://noometry.com/benchmarks/vending-bench-2) | 1,107 | #46 of 60, top 77% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |

### Reasoning

Grok 4.1 Fast Reasoning benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [SimpleBench](https://noometry.com/benchmarks/simplebench) | 56% | #32 of 77, top 42% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |
| [SimpleBench](https://noometry.com/benchmarks/simplebench) | 56% | #32 of 77, top 42% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |
| [NYT Connections (extended)](https://noometry.com/benchmarks/nyt-connections) | 87.4% | #25 of 91, top 28% |  | [Lech Mazur benchmarks](https://github.com/lechmazur/nyt-connections) |  |
| [NYT Connections (extended)](https://noometry.com/benchmarks/nyt-connections) | 12.3% |  |  | [Lech Mazur benchmarks](https://github.com/lechmazur/nyt-connections) |  |
| [LMArena Hard Prompts](https://noometry.com/benchmarks/arena-hard-prompts) | 1407 | #121 of 297, top 41% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [DTBench](https://noometry.com/benchmarks/dtbench) | 87.7% | #48 of 151, top 32% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |
| [ForecastBench](https://noometry.com/benchmarks/forecastbench) | 61 | #20 of 72, top 28% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |

### Math

Grok 4.1 Fast Math benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [MathArena Final-Answer Competitions](https://noometry.com/benchmarks/matharena) | 60.9% | #22 of 29, top 76% | reasoning | [MathArena](https://matharena.ai/) |  |
| [ProofBench](https://noometry.com/benchmarks/proofbench) | 4% | #70 of 77, top 91% |  | [Epoch AI](https://epoch.ai/benchmarks) |  |
| [LMArena Math](https://noometry.com/benchmarks/arena-math) | 1408 | #115 of 285, top 41% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |

### Knowledge

Grok 4.1 Fast Knowledge benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [Vectara Hallucination Rate](https://noometry.com/benchmarks/vectara-hallucination) (lower is better) | 17.8% | #87 of 96, top 91% |  | [Vectara Hallucination Leaderboard](https://github.com/vectara/hallucination-leaderboard) |  |
| [Vectara Hallucination Rate](https://noometry.com/benchmarks/vectara-hallucination) (lower is better) | 19.2% |  |  | [Vectara Hallucination Leaderboard](https://github.com/vectara/hallucination-leaderboard) |  |
| [LMArena Expert](https://noometry.com/benchmarks/arena-expert) | 1399 | #122 of 273, top 45% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |

### Multimodal

Grok 4.1 Fast Multimodal benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [LMArena Vision](https://noometry.com/benchmarks/arena-vision) | 1201 | #78 of 122, top 64% |  | [LMArena](https://lmarena.ai/leaderboard/vision) | 2026-10-09 |

### Multilingual

Grok 4.1 Fast Multilingual benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [LMArena Non-English](https://noometry.com/benchmarks/arena-non-english) | 1391 | #114 of 297, top 39% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena Chinese](https://noometry.com/benchmarks/arena-chinese) | 1441 | #111 of 285, top 39% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena French](https://noometry.com/benchmarks/arena-french) | 1415 | #106 of 223, top 48% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena German](https://noometry.com/benchmarks/arena-german) | 1404 | #93 of 231, top 41% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena Japanese](https://noometry.com/benchmarks/arena-japanese) | 1349 | #97 of 211, top 46% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena Korean](https://noometry.com/benchmarks/arena-korean) | 1361 | #92 of 213, top 44% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena Russian](https://noometry.com/benchmarks/arena-russian) | 1387 | #121 of 283, top 43% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena Spanish](https://noometry.com/benchmarks/arena-spanish) | 1413 | #99 of 226, top 44% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |

### Instruction Following

Grok 4.1 Fast Instruction Following benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [LMArena Instruction Following](https://noometry.com/benchmarks/arena-instruction-following) | 1376 | #127 of 298, top 43% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |

### Long Context

Grok 4.1 Fast Long Context benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [LMArena Longer Query](https://noometry.com/benchmarks/arena-longer-query) | 1390 | #127 of 291, top 44% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |

### Writing & Preference

Grok 4.1 Fast Writing & Preference benchmark results
| Benchmark | Score | Position | Setting | Source | Date |
| --- | --- | --- | --- | --- | --- |
| [LMArena Text](https://noometry.com/benchmarks/arena-text) | 1408 | #112 of 297, top 38% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [LMArena Creative Writing](https://noometry.com/benchmarks/arena-creative-writing) | 1394 | #88 of 295, top 30% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |
| [EQ-Bench Creative Writing](https://noometry.com/benchmarks/eqbench-creative-writing) | 1327 | #76 of 115, top 67% |  | [EQ-Bench](https://eqbench.com/creative_writing.html) |  |
| [LMArena Multi-Turn](https://noometry.com/benchmarks/arena-multi-turn) | 1389 | #129 of 295, top 44% |  | [LMArena](https://lmarena.ai/leaderboard/text) | 2026-10-08 |

## API pricing by provider

Grok 4.1 Fast API prices
| Route | Input $/M | Output $/M | Cached input $/M | Checked |
| --- | --- | --- | --- | --- |
| [azure](https://learn.microsoft.com/en-us/azure/ai-services/openai/concepts/models) | $0.20 | $0.50 | $0.05 | 2026-10-10 |
| [vertex](https://cloud.google.com/vertex-ai/generative-ai/docs/models) | $0.20 | $0.50 | $0.05 | 2026-10-10 |

[All xAI API prices →](https://noometry.com/llm-pricing/xai) [Estimate your cost →](https://noometry.com/tools/cost-calculator)

## Compare Grok 4.1 Fast

-   [Grok 4.1 Fast vs GLM-4.6](https://noometry.com/compare/glm-4-6-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs GLM-4.6V](https://noometry.com/compare/glm-4-6v-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs Grok 4.1](https://noometry.com/compare/grok-4-1-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs MiMo-V2-Flash](https://noometry.com/compare/grok-4-1-fast-vs-mimo-v2-flash)
-   [Grok 4.1 Fast vs Gemini 3.5 Flash Lite](https://noometry.com/compare/gemini-3-5-flash-lite-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs Hunyuan Turbos 20250226](https://noometry.com/compare/grok-4-1-fast-vs-hunyuan-turbos)
-   [Grok 4.1 Fast vs GPT-6 Astra](https://noometry.com/compare/gpt-6-astra-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs Claude Fable 5.1](https://noometry.com/compare/claude-fable-5-1-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs Gemini 3.8 Flash](https://noometry.com/compare/gemini-3-8-flash-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs Kimi K3](https://noometry.com/compare/grok-4-1-fast-vs-kimi-k3)
-   [Grok 4.1 Fast vs Qwen3.8 Max](https://noometry.com/compare/grok-4-1-fast-vs-qwen3-8-max)
-   [Grok 4.1 Fast vs GLM-5.3](https://noometry.com/compare/glm-5-3-vs-grok-4-1-fast)
-   [Grok 4.1 Fast vs Muse Spark 1.3](https://noometry.com/compare/grok-4-1-fast-vs-muse-spark-1-3)
-   [Grok 4.1 Fast vs DeepSeek V4 Pro](https://noometry.com/compare/deepseek-v4-pro-vs-grok-4-1-fast)

## Other xAI models

-   [Grok 4.6](https://noometry.com/models/grok-4-6)56.9
-   [Grok 4.5](https://noometry.com/models/grok-4-5)55.0
-   [Grok 4.7](https://noometry.com/models/grok-4-7)53.1
-   [Grok 4.20 (Non-Reasoning)](https://noometry.com/models/grok-4-20)48.6
-   [Grok 4](https://noometry.com/models/grok-4)48.1
-   [Grok 4.20 Multi-Agent](https://noometry.com/models/grok-4-20-multi-agent)46.2
-   [Grok 4.3](https://noometry.com/models/grok-4-3)43.8
-   [Grok 4.1](https://noometry.com/models/grok-4-1)41.5

## 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.

### Cite this page

Noometry. (2026). Grok 4.1 Fast benchmarks and pricing. Retrieved October 10, 2026, from https://noometry.com/models/grok-4-1-fast

Quote Noometry with a link back to this page. It is also available in [Markdown](https://noometry.com/md/models/grok-4-1-fast.md).