# GPT-5.5 Pro vs Qwen3.5-Flash

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 42.3 on the Noometry Index. Qwen3.5-Flash costs 386× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-5-pro-vs-qwen3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 9

## Summary

- They share 9 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Qwen3.5-Flash in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 83.8 to 36.3.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 87.7% for GPT-5.5 Pro and 18.2% for Qwen3.5-Flash.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 1M.

## Snapshot

| | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 64.3 | 42.3 |
| Rank | 7 | 105 |
| Context | 1.05M | 1M |
| Input $/M | $30 | $0.10 |
| Output $/M | $180 | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Pro: —
- Qwen3.5-Flash: 33.9 (#234)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| LMArena WebDev | — | 1243 |
| LMArena Coding | — | 1412 |
| ALE-Bench | — | 221.8 |

## Agentic & Tool Use

- GPT-5.5 Pro: —
- Qwen3.5-Flash: —

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Qwen3.5-Flash: 32.9 (#63)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| Chess Puzzles | 64% | 21% |
| DTBench | 96% | 82.9% |
| LMCA | 53.9% | 29.1% |
| Epoch Capabilities Index | 162.45 | 143.98 |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| LMArena Hard Prompts | — | 1404 |
| Mystery Game Puzzles | — | 20% |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Qwen3.5-Flash: 36.3 (#117)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | 18.2% |
| OTIS Mock AIME 2024-2025 | 100% | 84.4% |
| FrontierMath (Feb 2025 set) | 52.4% | 6.2% |
| FrontierMath Tier 4 (v1) | 39.6% | 0% |
| FrontierMath Tier 4 | 78% | — |
| LMArena Math | — | 1407 |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Qwen3.5-Flash: 43.2 (#84)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| GPQA Diamond | 93.9% | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |
| LMArena Expert | — | 1408 |

## Multilingual

- GPT-5.5 Pro: —
- Qwen3.5-Flash: 50.7 (#116)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | — | 1385 |
| LMArena Chinese | — | 1446 |
| LMArena French | — | 1412 |
| LMArena German | — | 1389 |
| LMArena Japanese | — | 1369 |
| LMArena Korean | — | 1344 |
| LMArena Russian | — | 1379 |
| LMArena Spanish | — | 1399 |

## Instruction Following

- GPT-5.5 Pro: —
- Qwen3.5-Flash: 72.8 (#133)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1374 |

## Long Context

- GPT-5.5 Pro: —
- Qwen3.5-Flash: 42.4 (#119)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | — | 1392 |

## Writing & Preference

- GPT-5.5 Pro: —
- Qwen3.5-Flash: 58.2 (#117)

| Benchmark | GPT-5.5 Pro | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | — | 1397 |
| LMArena Creative Writing | — | 1343 |
| LMArena Multi-Turn | — | 1393 |

## FAQ

### Is GPT-5.5 Pro better than Qwen3.5-Flash?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 42.3 on the Noometry Index. Qwen3.5-Flash costs 386× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 Pro 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-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 1M.

### How many benchmarks do GPT-5.5 Pro and Qwen3.5-Flash share?

9 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Qwen3.5-Flash has 32.