# GLM-4.5 vs Step 3.5 Flash

> GLM-4.5 and Step 3.5 Flash score almost the same on the Noometry Index (42.0 vs 42.3), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/glm-4-5-vs-step-3-5-flash
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GLM-4.5 scores higher in 3 categories and Step 3.5 Flash in 5 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GLM-4.5 leads 28.6 to 22.2.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.60 / $2.20 for GLM-4.5.
- Step 3.5 Flash accepts more context: 256K tokens versus 131K.

## Snapshot

| | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| Provider | Z.ai (Zhipu) | StepFun |
| Noometry Index | 42.0 | 42.3 |
| Rank | 122 | 116 |
| Context | 131K | 256K |
| Input $/M | $0.60 | $0.10 |
| Output $/M | $2.20 | $0.30 |
| Weights | Open | Open |

## Coding

- GLM-4.5: 41.4 (#125)
- Step 3.5 Flash: 42.4 (#105)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1434 | 1436 |
| SWE-bench Verified (bash only) | 54.2% | — |
| WeirdML | 40.6% | — |
| ALE-Bench | 344.82 | — |
| AlgoTune | 1.52 | — |

## Reasoning

- GLM-4.5: 28.6 (#100)
- Step 3.5 Flash: 22.2 (#202)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1429 | 1411 |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | — | 28.4% |

## Math

- GLM-4.5: 39.0 (#116)
- Step 3.5 Flash: 42.6 (#84)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1427 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |

## Knowledge

- GLM-4.5: 35.9 (#179)
- Step 3.5 Flash: 39.6 (#132)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1433 | 1421 |
| Humanity's Last Exam | 8.3% | — |
| Confabulations | 11.3% | — |

## Multilingual

- GLM-4.5: 52.8 (#77)
- Step 3.5 Flash: 50.5 (#119)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1417 | 1385 |
| LMArena Chinese | 1465 | 1447 |
| LMArena French | 1418 | 1421 |
| LMArena German | 1407 | 1405 |
| LMArena Japanese | 1415 | 1354 |
| LMArena Korean | 1380 | 1352 |
| LMArena Russian | 1414 | 1385 |
| LMArena Spanish | 1454 | 1419 |

## Instruction Following

- GLM-4.5: 74.1 (#104)
- Step 3.5 Flash: 73.1 (#124)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1404 | 1385 |

## Long Context

- GLM-4.5: 38.2 (#201)
- Step 3.5 Flash: 42.8 (#117)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1412 | 1402 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- GLM-4.5: 57.5 (#127)
- Step 3.5 Flash: 58.8 (#113)

| Benchmark | GLM-4.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1430 | 1403 |
| LMArena Creative Writing | 1395 | 1357 |
| LMArena Multi-Turn | 1415 | 1405 |
| Short-Story Creative Writing | 73.4% | — |
| EQ-Bench Creative Writing | 1343 | — |

## FAQ

### Is GLM-4.5 better than Step 3.5 Flash?

GLM-4.5 and Step 3.5 Flash score almost the same on the Noometry Index (42.0 vs 42.3), so choose on price, context window or the category you care about most.

### Which is cheaper, GLM-4.5 or Step 3.5 Flash?

Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; GLM-4.5 lists at $0.60 and $2.20.

### Is GLM-4.5 or Step 3.5 Flash better for coding?

They score almost the same on coding (41.4 vs 42.4); test both on your own repository before choosing.

### Which has the bigger context window?

Step 3.5 Flash does, with 256K tokens against 131K.

### How many benchmarks do GLM-4.5 and Step 3.5 Flash share?

17 benchmarks have published results for both models. GLM-4.5 has 27 scored results on Noometry and Step 3.5 Flash has 19.