# GLM-5.1 vs Step 5 Preview

> GLM-5.1 and Step 5 Preview score almost the same on the Noometry Index (47.8 vs 47.9), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/glm-5-1-vs-step-5-preview
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GLM-5.1 scores higher in 6 categories and Step 5 Preview in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GLM-5.1 leads 54.9 to 41.2.
- The biggest single-benchmark swing is ProofBench: 22.2% for GLM-5.1 and 42% for Step 5 Preview.
- Step 5 Preview is cheaper at $1 / $2.70 per million input/output tokens, against $1.40 / $4.40 for GLM-5.1.
- Step 5 Preview accepts more context: 1.02M tokens versus 200K.
- GLM-5.1 has downloadable open weights; the other is API-only.

## Snapshot

| | GLM-5.1 | Step 5 Preview |
|---|---|---|
| Provider | Z.ai (Zhipu) | StepFun |
| Noometry Index | 47.8 | 47.9 |
| Rank | 59 | 58 |
| Context | 200K | 1.02M |
| Input $/M | $1.40 | $1 |
| Output $/M | $4.40 | $2.70 |
| Weights | Open | Proprietary |

## Coding

- GLM-5.1: 48.7 (#55)
- Step 5 Preview: 51.8 (#36)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1508 | 1564 |
| SciCode | 43.8% | 58.9% |
| LMArena Coding | 1485 | 1480 |
| SWE-bench Verified | 74.2% | — |
| WeirdML | 57.1% | — |
| ALE-Bench | 887.1 | — |

## Agentic & Tool Use

- GLM-5.1: 24.9 (#113)
- Step 5 Preview: —

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| APEX-Agents | 40.9% | — |
| ExploitBench | 18.1% | — |
| GBAEval | 0% | — |
| Vending-Bench 2 | 5,634 | — |

## Reasoning

- GLM-5.1: 39.1 (#60)
- Step 5 Preview: 40.0 (#57)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| CritPt | 4.6% | 20.9% |
| LMArena Hard Prompts | 1472 | 1465 |
| SimpleBench | 55.1% | — |
| NYT Connections (extended) | 77.7% | — |
| Chess Puzzles | 19% | — |
| Thematic Generalization | 69.8% | — |
| Epoch Capabilities Index | 149.84 | — |

## Math

- GLM-5.1: 49.7 (#60)
- Step 5 Preview: 46.1 (#72)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| ProofBench | 22.2% | 42% |
| LMArena Math | 1473 | 1470 |
| FrontierMath (Tiers 1-3) | 36.8% | — |
| MathArena Final-Answer Competitions | 67.1% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
| FrontierMath (Feb 2025 set) | 33.4% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |

## Knowledge

- GLM-5.1: 54.9 (#50)
- Step 5 Preview: 41.2 (#112)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1476 | 1470 |
| GPQA Diamond | 89.9% | — |
| SimpleQA Verified | 34% | — |

## Multimodal

- GLM-5.1: —
- Step 5 Preview: 41.0 (#41)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |

## Multilingual

- GLM-5.1: 55.0 (#36)
- Step 5 Preview: 53.8 (#54)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1447 | 1432 |
| LMArena Chinese | 1515 | 1519 |
| LMArena Russian | 1454 | 1436 |
| LMArena Spanish | 1469 | 1439 |
| LMArena French | 1474 | — |
| LMArena German | 1465 | — |
| LMArena Japanese | 1434 | — |
| LMArena Korean | 1418 | — |

## Instruction Following

- GLM-5.1: 76.3 (#42)
- Step 5 Preview: 76.0 (#50)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1451 | 1444 |

## Long Context

- GLM-5.1: 44.9 (#53)
- Step 5 Preview: 44.5 (#64)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1466 | 1455 |

## Writing & Preference

- GLM-5.1: 66.9 (#31)
- Step 5 Preview: 62.8 (#71)

| Benchmark | GLM-5.1 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1461 | 1442 |
| LMArena Creative Writing | 1453 | 1410 |
| LMArena Multi-Turn | 1472 | 1447 |
| EQ-Bench Creative Writing | 1592 | — |

## FAQ

### Is GLM-5.1 better than Step 5 Preview?

GLM-5.1 and Step 5 Preview score almost the same on the Noometry Index (47.8 vs 47.9), so choose on price, context window or the category you care about most.

### Which is cheaper, GLM-5.1 or Step 5 Preview?

Step 5 Preview is cheaper. It lists at $1 per million input tokens and $2.70 per million output tokens; GLM-5.1 lists at $1.40 and $4.40.

### Is GLM-5.1 or Step 5 Preview better for coding?

Step 5 Preview scores higher on coding benchmarks: 51.8 versus 48.7 in the Noometry coding category.

### Which has the bigger context window?

Step 5 Preview does, with 1.02M tokens against 200K.

### How many benchmarks do GLM-5.1 and Step 5 Preview share?

17 benchmarks have published results for both models. GLM-5.1 has 41 scored results on Noometry and Step 5 Preview has 18.