Model comparison
Qwen1.5-14B vs Qwen3.5-Flash
Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 32.7 on the Noometry Index.
Last verified . 16 shared benchmarks.
Alibaba (Qwen)Summary
- They share 16 benchmarks with published results for both. Qwen1.5-14B scores higher in 0 categories and Qwen3.5-Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Qwen3.5-Flash leads 57.9 to 33.6.
- Qwen1.5-14B has downloadable open weights; the other is API-only.
Side by side
| Qwen1.5-14B | Qwen3.5-Flash | |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 32.7 | 42.5 |
| Released | 2024-02-04 | 2026-02-23 |
| Weights | Open | Proprietary |
| Context window | — | 1M |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.40 |
| Results tracked | 17 | 32 |
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Category by category
Coding Qwen3.5-Flash leads
Qwen1.5-14B: 33.1 (#263), Qwen3.5-Flash: 34.2 (#242)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1138 | 1412 |
| LMArena WebDev | — | 1244 |
| ALE-Bench | — | 221.8 |
Agentic & Tool Use Not comparable
Qwen1.5-14B: —, Qwen3.5-Flash: —
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |
Reasoning Qwen3.5-Flash leads
Qwen1.5-14B: 21.4 (#223), Qwen3.5-Flash: 33.7 (#72)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Hard Prompts | 1113 | 1403 |
| Chess Puzzles | — | 21% |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LMCA | — | 29.1% |
| Epoch Capabilities Index | — | 143.98 |
Math Qwen3.5-Flash leads
Qwen1.5-14B: 32.4 (#215), Qwen3.5-Flash: 37.4 (#158)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Math | 1125 | 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 Qwen3.5-Flash leads
Qwen1.5-14B: 29.8 (#232), Qwen3.5-Flash: 43.2 (#93)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Expert | 1094 | 1407 |
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |
| MMLU | 68.6% | — |
Multilingual Qwen3.5-Flash leads
Qwen1.5-14B: 30.7 (#262), Qwen3.5-Flash: 50.5 (#121)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1095 | 1385 |
| LMArena Chinese | 1147 | 1446 |
| LMArena French | 1116 | 1412 |
| LMArena German | 1043 | 1390 |
| LMArena Japanese | 1019 | 1368 |
| LMArena Russian | 1046 | 1379 |
| LMArena Spanish | 1085 | 1400 |
| LMArena Korean | — | 1344 |
Instruction Following Qwen3.5-Flash leads
Qwen1.5-14B: 56.8 (#271), Qwen3.5-Flash: 72.6 (#139)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1102 | 1374 |
Long Context Qwen3.5-Flash leads
Qwen1.5-14B: 33.7 (#257), Qwen3.5-Flash: 42.4 (#124)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1113 | 1392 |
Writing & Preference Qwen3.5-Flash leads
Qwen1.5-14B: 33.6 (#276), Qwen3.5-Flash: 57.9 (#122)
| Benchmark | Qwen1.5-14B | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1128 | 1397 |
| LMArena Creative Writing | 1091 | 1343 |
| LMArena Multi-Turn | 1110 | 1393 |
Frequently asked questions
Is Qwen1.5-14B better than Qwen3.5-Flash?
Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 32.7 on the Noometry Index.
Is Qwen1.5-14B or Qwen3.5-Flash better for coding?
Qwen3.5-Flash scores higher on coding benchmarks: 34.2 versus 33.1 in the Noometry coding category.
How many benchmarks do Qwen1.5-14B and Qwen3.5-Flash share?
16 benchmarks have published results for both models. Qwen1.5-14B has 17 scored results on Noometry and Qwen3.5-Flash has 32.