# GLM-4.5V vs Grok 4.1 Fast

> Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 39.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/glm-4-5v-vs-grok-4-1-fast
- Last updated: 2026-10-10
- Shared benchmarks: 14

## Summary

- They share 14 benchmarks with published results for both. GLM-4.5V scores higher in 3 categories and Grok 4.1 Fast in 6 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 26.5.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.60 / $1.80 for GLM-4.5V.
- Grok 4.1 Fast accepts more context: 128K tokens versus 64K.
- GLM-4.5V has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 39.2 | 40.9 |
| Rank | 158 | 131 |
| Context | 64K | 128K |
| Input $/M | $0.60 | $0.20 |
| Output $/M | $1.80 | $0.50 |
| Weights | Open | Proprietary |

## Coding

- GLM-4.5V: 38.9 (#152)
- Grok 4.1 Fast: 33.8 (#236)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1347 | 1411 |
| LMArena WebDev | — | 1241 |
| ALE-Bench | — | 394.93 |

## Agentic & Tool Use

- GLM-4.5V: —
- Grok 4.1 Fast: 36.1 (#35)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |

## Reasoning

- GLM-4.5V: 26.5 (#118)
- Grok 4.1 Fast: 42.3 (#45)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1335 | 1407 |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 59.8% | — |
| NYT Connections (extended) | — | 87.4% |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |

## Math

- GLM-4.5V: 34.7 (#157)
- Grok 4.1 Fast: 30.9 (#201)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1353 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |

## Knowledge

- GLM-4.5V: 36.8 (#155)
- Grok 4.1 Fast: 32.6 (#203)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1353 | 1398 |
| Vectara Hallucination Rate | — | 17.8% |

## Multimodal

- GLM-4.5V: 33.6 (#86)
- Grok 4.1 Fast: 36.3 (#71)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1154 | 1201 |

## Multilingual

- GLM-4.5V: 44.9 (#172)
- Grok 4.1 Fast: 51.1 (#110)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1304 | 1391 |
| LMArena Chinese | 1338 | 1441 |
| LMArena Russian | 1299 | 1387 |
| LMArena Spanish | 1335 | 1411 |
| LMArena French | — | 1416 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1347 |
| LMArena Korean | — | 1361 |

## Instruction Following

- GLM-4.5V: 69.4 (#170)
- Grok 4.1 Fast: 72.8 (#127)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1311 | 1376 |

## Long Context

- GLM-4.5V: 39.6 (#166)
- Grok 4.1 Fast: 42.4 (#121)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1305 | 1390 |

## Writing & Preference

- GLM-4.5V: 52.7 (#162)
- Grok 4.1 Fast: 57.4 (#126)

| Benchmark | GLM-4.5V | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1333 | 1408 |
| LMArena Creative Writing | 1295 | 1394 |
| LMArena Multi-Turn | 1333 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |

## FAQ

### Is GLM-4.5V better than Grok 4.1 Fast?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 39.2 on the Noometry Index.

### Which is cheaper, GLM-4.5V or Grok 4.1 Fast?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; GLM-4.5V lists at $0.60 and $1.80.

### Is GLM-4.5V or Grok 4.1 Fast better for coding?

GLM-4.5V scores higher on coding benchmarks: 38.9 versus 33.8 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.1 Fast does, with 128K tokens against 64K.

### How many benchmarks do GLM-4.5V and Grok 4.1 Fast share?

14 benchmarks have published results for both models. GLM-4.5V has 15 scored results on Noometry and Grok 4.1 Fast has 32.