# GPT-5.3 Chat vs Qwen3.5-Flash

> GPT-5.3 Chat and Qwen3.5-Flash score almost the same on the Noometry Index (42.1 vs 42.3), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-qwen3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 4 categories and Qwen3.5-Flash in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Chat leads 40.8 to 33.9.
- Qwen3.5-Flash is cheaper at $0.10 / $0.40 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Qwen3.5-Flash accepts more context: 1M tokens versus 128K.

## Snapshot

| | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| Provider | OpenAI | Alibaba (Qwen) |
| Noometry Index | 42.1 | 42.3 |
| Rank | 109 | 105 |
| Context | 128K | 1M |
| Input $/M | $1.75 | $0.10 |
| Output $/M | $14 | $0.40 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Chat: 40.8 (#124)
- Qwen3.5-Flash: 33.9 (#234)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1408 | 1412 |
| LMArena WebDev | — | 1243 |
| ALE-Bench | — | 221.8 |

## Agentic & Tool Use

- GPT-5.3 Chat: —
- Qwen3.5-Flash: —

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |

## Reasoning

- GPT-5.3 Chat: 27.3 (#105)
- Qwen3.5-Flash: 32.9 (#63)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1404 |
| Chess Puzzles | — | 21% |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LMCA | — | 29.1% |
| Epoch Capabilities Index | — | 143.98 |

## Math

- GPT-5.3 Chat: 35.4 (#146)
- Qwen3.5-Flash: 36.3 (#117)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Math | 1389 | 1407 |
| FrontierMath (Tiers 1-3) | — | 18.2% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |

## Knowledge

- GPT-5.3 Chat: 38.2 (#137)
- Qwen3.5-Flash: 43.2 (#84)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Expert | 1397 | 1408 |
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |

## Multilingual

- GPT-5.3 Chat: 50.5 (#119)
- Qwen3.5-Flash: 50.7 (#116)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1383 | 1385 |
| LMArena Chinese | 1433 | 1446 |
| LMArena French | 1398 | 1412 |
| LMArena German | 1384 | 1389 |
| LMArena Japanese | 1351 | 1369 |
| LMArena Korean | 1347 | 1344 |
| LMArena Russian | 1400 | 1379 |
| LMArena Spanish | 1371 | 1399 |

## Instruction Following

- GPT-5.3 Chat: 73.0 (#124)
- Qwen3.5-Flash: 72.8 (#133)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1378 | 1374 |

## Long Context

- GPT-5.3 Chat: 42.6 (#115)
- Qwen3.5-Flash: 42.4 (#119)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1396 | 1392 |

## Writing & Preference

- GPT-5.3 Chat: 63.3 (#65)
- Qwen3.5-Flash: 58.2 (#117)

| Benchmark | GPT-5.3 Chat | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1389 | 1397 |
| LMArena Creative Writing | 1356 | 1343 |
| LMArena Multi-Turn | 1413 | 1393 |
| EQ-Bench Creative Writing | 1690 | — |

## FAQ

### Is GPT-5.3 Chat better than Qwen3.5-Flash?

GPT-5.3 Chat and Qwen3.5-Flash score almost the same on the Noometry Index (42.1 vs 42.3), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.3 Chat 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-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Qwen3.5-Flash better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 33.9 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-5.3 Chat and Qwen3.5-Flash share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Qwen3.5-Flash has 32.