# GLM-5.1 vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 47.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/glm-5-1-vs-grok-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 35

## Summary

- They share 35 benchmarks with published results for both. GLM-5.1 scores higher in 4 categories and Grok 4.5 in 5 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Grok 4.5 leads 44.4 to 24.9.
- The biggest single-benchmark swing is GBAEval: 0% for GLM-5.1 and 65.4% for Grok 4.5.
- GLM-5.1 is cheaper at $1.40 / $4.40 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Grok 4.5 accepts more context: 500K tokens versus 200K.
- GLM-5.1 has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-5.1 | Grok 4.5 |
|---|---|---|
| Provider | Z.ai (Zhipu) | xAI |
| Noometry Index | 47.8 | 55.0 |
| Rank | 59 | 25 |
| Context | 200K | 500K |
| Input $/M | $1.40 | $2 |
| Output $/M | $4.40 | $6 |
| Weights | Open | Proprietary |

## Coding

- GLM-5.1: 48.7 (#55)
- Grok 4.5: 52.2 (#35)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1508 | 1553 |
| SciCode | 43.8% | 54.1% |
| WeirdML | 57.1% | 46.4% |
| LMArena Coding | 1485 | 1474 |
| ALE-Bench | 887.1 | 1,309 |
| SWE-bench Verified | 74.2% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |

## Agentic & Tool Use

- GLM-5.1: 24.9 (#113)
- Grok 4.5: 44.4 (#17)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| APEX-Agents | 40.9% | 56.2% |
| GBAEval | 0% | 65.4% |
| Vending-Bench 2 | 5,634 | 3,887 |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| ExploitBench | 18.1% | — |
| GDP.pdf | — | 14% |
| LMArena Search | — | 1213 |

## Reasoning

- GLM-5.1: 39.1 (#60)
- Grok 4.5: 56.1 (#25)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| SimpleBench | 55.1% | 70% |
| NYT Connections (extended) | 77.7% | 79.9% |
| CritPt | 4.6% | 15.4% |
| Chess Puzzles | 19% | 36% |
| LMArena Hard Prompts | 1472 | 1462 |
| Epoch Capabilities Index | 149.84 | 153.92 |
| ARC-AGI-2 | — | 52.6% |
| Kagi LLM Benchmark | — | 83.5% |
| ARC-AGI-1 | — | 87.2% |
| Thematic Generalization | 69.8% | — |
| DTBench | — | 96.5% |
| LMCA | — | 45.2% |
| Surface Evolver Bench | — | 74.4% |

## Math

- GLM-5.1: 49.7 (#60)
- Grok 4.5: 60.9 (#35)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 36.8% | 57.2% |
| OTIS Mock AIME 2024-2025 | 93.3% | 97.8% |
| ProofBench | 22.2% | 31% |
| LMArena Math | 1473 | 1459 |
| FrontierMath Tier 4 | — | 24.4% |
| MathArena Final-Answer Competitions | 67.1% | — |
| FrontierMath (Feb 2025 set) | 33.4% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |

## Knowledge

- GLM-5.1: 54.9 (#50)
- Grok 4.5: 62.3 (#24)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 89.9% | 93.4% |
| SimpleQA Verified | 34% | 48.3% |
| LMArena Expert | 1476 | 1466 |

## Multimodal

- GLM-5.1: —
- Grok 4.5: 37.6 (#72)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| LMArena Vision | — | 1288 |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |

## Multilingual

- GLM-5.1: 55.0 (#36)
- Grok 4.5: 54.4 (#42)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1447 | 1440 |
| LMArena Chinese | 1515 | 1496 |
| LMArena French | 1474 | 1456 |
| LMArena German | 1465 | 1446 |
| LMArena Japanese | 1434 | 1428 |
| LMArena Korean | 1418 | 1404 |
| LMArena Russian | 1454 | 1448 |
| LMArena Spanish | 1469 | 1450 |

## Instruction Following

- GLM-5.1: 76.3 (#42)
- Grok 4.5: 76.0 (#48)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1451 | 1446 |

## Long Context

- GLM-5.1: 44.9 (#53)
- Grok 4.5: 44.8 (#56)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1466 | 1463 |

## Writing & Preference

- GLM-5.1: 66.9 (#31)
- Grok 4.5: 65.8 (#42)

| Benchmark | GLM-5.1 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1461 | 1448 |
| LMArena Creative Writing | 1453 | 1442 |
| EQ-Bench Creative Writing | 1592 | 1579 |
| LMArena Multi-Turn | 1472 | 1456 |

## FAQ

### Is GLM-5.1 better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 47.8 on the Noometry Index.

### Which is cheaper, GLM-5.1 or Grok 4.5?

GLM-5.1 is cheaper. It lists at $1.40 per million input tokens and $4.40 per million output tokens; Grok 4.5 lists at $2 and $6.

### Is GLM-5.1 or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 48.7 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.5 does, with 500K tokens against 200K.

### How many benchmarks do GLM-5.1 and Grok 4.5 share?

35 benchmarks have published results for both models. GLM-5.1 has 41 scored results on Noometry and Grok 4.5 has 52.