# GLM-4.5 vs Grok 4.1 Fast

> GLM-4.5 and Grok 4.1 Fast score almost the same on the Noometry Index (41.4 vs 40.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/glm-4-5-vs-grok-4-1-fast
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. GLM-4.5 scores higher in 6 categories and Grok 4.1 Fast in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 27.7.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.60 / $2.20 for GLM-4.5.
- GLM-4.5 accepts more context: 131K tokens versus 128K.
- GLM-4.5 has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 41.4 | 40.9 |
| Rank | 125 | 131 |
| Context | 131K | 128K |
| Input $/M | $0.60 | $0.20 |
| Output $/M | $2.20 | $0.50 |
| Weights | Open | Proprietary |

## Coding

- GLM-4.5: 41.1 (#121)
- Grok 4.1 Fast: 33.8 (#236)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1434 | 1411 |
| ALE-Bench | 344.82 | 394.93 |
| SWE-bench Verified (bash only) | 54.2% | — |
| LMArena WebDev | — | 1241 |
| WeirdML | 40.6% | — |
| AlgoTune | 1.52 | — |

## Agentic & Tool Use

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

| Benchmark | GLM-4.5 | 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-4.5: 27.7 (#99)
- Grok 4.1 Fast: 42.3 (#45)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1430 | 1407 |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | — | 87.4% |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |

## Math

- GLM-4.5: 36.3 (#119)
- Grok 4.1 Fast: 30.9 (#201)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1427 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |

## Knowledge

- GLM-4.5: 35.5 (#172)
- Grok 4.1 Fast: 32.6 (#203)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1433 | 1398 |
| Humanity's Last Exam | 8.3% | — |
| Confabulations | 11.3% | — |
| Vectara Hallucination Rate | — | 17.8% |

## Multimodal

- GLM-4.5: —
- Grok 4.1 Fast: 36.3 (#71)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |

## Multilingual

- GLM-4.5: 53.0 (#74)
- Grok 4.1 Fast: 51.1 (#110)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1417 | 1391 |
| LMArena Chinese | 1465 | 1441 |
| LMArena French | 1423 | 1416 |
| LMArena German | 1406 | 1404 |
| LMArena Japanese | 1416 | 1347 |
| LMArena Korean | 1382 | 1361 |
| LMArena Russian | 1414 | 1387 |
| LMArena Spanish | 1454 | 1411 |

## Instruction Following

- GLM-4.5: 74.3 (#100)
- Grok 4.1 Fast: 72.8 (#127)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1405 | 1376 |

## Long Context

- GLM-4.5: 38.2 (#196)
- Grok 4.1 Fast: 42.4 (#121)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1413 | 1390 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- GLM-4.5: 57.7 (#121)
- Grok 4.1 Fast: 57.4 (#126)

| Benchmark | GLM-4.5 | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1430 | 1408 |
| LMArena Creative Writing | 1395 | 1394 |
| EQ-Bench Creative Writing | 1343 | 1327 |
| LMArena Multi-Turn | 1415 | 1389 |
| Short-Story Creative Writing | 73.4% | — |

## FAQ

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

GLM-4.5 and Grok 4.1 Fast score almost the same on the Noometry Index (41.4 vs 40.9), so choose on price, context window or the category you care about most.

### Which is cheaper, GLM-4.5 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-4.5 lists at $0.60 and $2.20.

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

GLM-4.5 scores higher on coding benchmarks: 41.1 versus 33.8 in the Noometry coding category.

### Which has the bigger context window?

GLM-4.5 does, with 131K tokens against 128K.

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

19 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and Grok 4.1 Fast has 32.