# GPT-4o vs Qwen3.5-Flash

> Qwen3.5-Flash is the stronger model overall, scoring 42.3 to 28.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-4o-vs-qwen3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 27

## Summary

- They share 27 benchmarks with published results for both. GPT-4o scores higher in 0 categories and Qwen3.5-Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Qwen3.5-Flash leads 36.3 to 10.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 6.4% for GPT-4o and 84.4% for Qwen3.5-Flash.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $2.50 / $10 for GPT-4o.
- Qwen3.5-Flash accepts more context: 1M tokens versus 128K.

## Snapshot

| | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 28.5 | 42.3 |
| Rank | 316 | 105 |
| Context | 128K | 1M |
| Input $/M | $2.50 | $0.10 |
| Output $/M | $10 | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-4o: 25.1 (#323)
- Qwen3.5-Flash: 33.9 (#234)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1297 | 1412 |
| SWE-bench Verified | 31% | — |
| SWE-bench Verified (bash only) | 21.6% | — |
| Aider Polyglot | 45.3% | — |
| LMArena WebDev | — | 1243 |
| GSO | 0% | — |
| WeirdML | 25.1% | — |
| BigCodeBench Instruct | 51.1% | — |
| LiveBench Coding | 51.4% | — |
| BigCodeBench Complete | 61.1% | — |
| CadEval | 26% | — |
| ALE-Bench | — | 221.8 |
| HumanEval+ | 87.2% | — |
| MBPP+ | 72.2% | — |

## Agentic & Tool Use

- GPT-4o: 20.8 (#133)
- Qwen3.5-Flash: —

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| GDPval | 9.9% | — |
| TheAgentCompany | 8.6% | — |
| Cybench | 12.5% | — |
| BALROG | 32.3% | — |
| LMArena Search | 1006 | — |
| METR Time Horizons | 40.8% | — |
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- GPT-4o: 9.4 (#338)
- Qwen3.5-Flash: 32.9 (#63)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| Chess Puzzles | 13% | 21% |
| LMArena Hard Prompts | 1281 | 1404 |
| DTBench | 64.5% | 82.9% |
| LMCA | 16.6% | 29.1% |
| Epoch Capabilities Index | 128.97 | 143.98 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 17.8% | — |
| ARC-AGI-1 | 4.5% | — |
| CritPt | 0% | — |
| EnigmaEval | 0.8% | — |
| LiveBench Reasoning | 55.8% | — |
| Mystery Game Puzzles | — | 20% |
| LiveBench Data Analysis | 60.9% | — |
| ForecastBench | 57.7 | — |
| LiveBench | 55.3% | — |

## Math

- GPT-4o: 10.2 (#303)
- Qwen3.5-Flash: 36.3 (#117)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 0.4% | 18.2% |
| OTIS Mock AIME 2024-2025 | 6.4% | 84.4% |
| LMArena Math | 1285 | 1407 |
| FrontierMath (Feb 2025 set) | 0.3% | 6.2% |
| Omni-MATH | 29.3% | — |
| LiveBench Math | 49.5% | — |
| MATH Level 5 | 53.3% | — |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- GPT-4o: 28.8 (#235)
- Qwen3.5-Flash: 43.2 (#84)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| GPQA Diamond | 49.2% | 82.3% |
| SimpleQA Verified | 26% | 20.3% |
| Vectara Hallucination Rate | 9.6% | 10.5% |
| LMArena Expert | 1250 | 1408 |
| Humanity's Last Exam | 2.7% | — |
| MMLU-Pro | 71.3% | — |
| Confabulations | 15.3% | — |
| GPQA (HELM) | 52% | — |
| MMLU | 88.1% | — |

## Multimodal

- GPT-4o: 33.9 (#85)
- Qwen3.5-Flash: —

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| LMArena Vision | 1137 | — |
| Video-MME | 71.9% | — |
| GeoBench | 71% | — |
| VPCT | 40% | — |
| ScienceQA | 88.5% | — |

## Multilingual

- GPT-4o: 43.4 (#181)
- Qwen3.5-Flash: 50.7 (#116)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1283 | 1385 |
| LMArena Chinese | 1277 | 1446 |
| LMArena French | 1303 | 1412 |
| LMArena German | 1282 | 1389 |
| LMArena Japanese | 1257 | 1369 |
| LMArena Korean | 1234 | 1344 |
| LMArena Russian | 1286 | 1379 |
| LMArena Spanish | 1292 | 1399 |

## Instruction Following

- GPT-4o: 66.8 (#202)
- Qwen3.5-Flash: 72.8 (#133)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1278 | 1374 |
| LiveBench Instruction Following | 68.6% | — |
| IFEval | 81.7% | — |

## Long Context

- GPT-4o: 39.4 (#174)
- Qwen3.5-Flash: 42.4 (#119)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1289 | 1392 |
| Fiction.LiveBench | 66.7% | — |

## Writing & Preference

- GPT-4o: 52.8 (#160)
- Qwen3.5-Flash: 58.2 (#117)

| Benchmark | GPT-4o | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1300 | 1397 |
| LMArena Creative Writing | 1291 | 1343 |
| LMArena Multi-Turn | 1302 | 1393 |
| Short-Story Creative Writing | 81.8% | — |
| WildBench | 82.8% | — |
| LiveBench Language | 47.6% | — |

## FAQ

### Is GPT-4o better than Qwen3.5-Flash?

Qwen3.5-Flash is the stronger model overall, scoring 42.3 to 28.5 on the Noometry Index.

### Which is cheaper, GPT-4o or Qwen3.5-Flash?

Qwen3.5-Flash is cheaper. It lists at $0.10 per million input tokens and $0.40 per million output tokens; GPT-4o lists at $2.50 and $10.

### Is GPT-4o or Qwen3.5-Flash better for coding?

Qwen3.5-Flash scores higher on coding benchmarks: 33.9 versus 25.1 in the Noometry coding category.

### Which has the bigger context window?

Qwen3.5-Flash does, with 1M tokens against 128K.

### How many benchmarks do GPT-4o and Qwen3.5-Flash share?

27 benchmarks have published results for both models. GPT-4o has 72 scored results on Noometry and Qwen3.5-Flash has 32.