Model comparison
Qwen2.5 Plus 1127 vs Qwen3.5-Flash
Qwen3.5-Flash is the stronger model overall, scoring 42.3 to 38.1 on the Noometry Index.
Last verified . 14 shared benchmarks.
Alibaba (Qwen)Summary
- They share 14 benchmarks with published results for both. Qwen2.5 Plus 1127 scores higher in 1 category and Qwen3.5-Flash in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Qwen3.5-Flash leads 58.2 to 49.5.
Side by side
| Qwen2.5 Plus 1127 | Qwen3.5-Flash | |
|---|---|---|
| Provider | Alibaba (Qwen) | Alibaba (Qwen) |
| Noometry Index | 38.1 | 42.3 |
| Released | — | 2026-02-23 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.40 |
| Results tracked | 14 | 32 |
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Category by category
Coding Qwen2.5 Plus 1127 leads
Qwen2.5 Plus 1127: 37.9 (#171), Qwen3.5-Flash: 33.9 (#234)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Coding | 1314 | 1412 |
| LMArena WebDev | — | 1243 |
| ALE-Bench | — | 221.8 |
Agentic & Tool Use Not comparable
Qwen2.5 Plus 1127: —, Qwen3.5-Flash: —
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |
Reasoning Qwen3.5-Flash leads
Qwen2.5 Plus 1127: 24.8 (#139), Qwen3.5-Flash: 32.9 (#63)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Hard Prompts | 1299 | 1404 |
| Chess Puzzles | — | 21% |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LMCA | — | 29.1% |
| Epoch Capabilities Index | — | 143.98 |
Math Qwen3.5-Flash leads
Qwen2.5 Plus 1127: 33.5 (#175), Qwen3.5-Flash: 36.3 (#117)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Math | 1298 | 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
Qwen2.5 Plus 1127: 34.9 (#179), Qwen3.5-Flash: 43.2 (#84)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Expert | 1289 | 1408 |
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |
Multilingual Qwen3.5-Flash leads
Qwen2.5 Plus 1127: 42.1 (#196), Qwen3.5-Flash: 50.7 (#116)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | 1265 | 1385 |
| LMArena Chinese | 1314 | 1446 |
| LMArena German | 1231 | 1389 |
| LMArena Japanese | 1207 | 1369 |
| LMArena Russian | 1271 | 1379 |
| LMArena French | — | 1412 |
| LMArena Korean | — | 1344 |
| LMArena Spanish | — | 1399 |
Instruction Following Qwen3.5-Flash leads
Qwen2.5 Plus 1127: 67.4 (#194), Qwen3.5-Flash: 72.8 (#133)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | 1275 | 1374 |
Long Context Qwen3.5-Flash leads
Qwen2.5 Plus 1127: 39.2 (#180), Qwen3.5-Flash: 42.4 (#119)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | 1292 | 1392 |
Writing & Preference Qwen3.5-Flash leads
Qwen2.5 Plus 1127: 49.5 (#186), Qwen3.5-Flash: 58.2 (#117)
| Benchmark | Qwen2.5 Plus 1127 | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | 1299 | 1397 |
| LMArena Creative Writing | 1262 | 1343 |
| LMArena Multi-Turn | 1299 | 1393 |
Frequently asked questions
Is Qwen2.5 Plus 1127 better than Qwen3.5-Flash?
Qwen3.5-Flash is the stronger model overall, scoring 42.3 to 38.1 on the Noometry Index.
Is Qwen2.5 Plus 1127 or Qwen3.5-Flash better for coding?
Qwen2.5 Plus 1127 scores higher on coding benchmarks: 37.9 versus 33.9 in the Noometry coding category.
How many benchmarks do Qwen2.5 Plus 1127 and Qwen3.5-Flash share?
14 benchmarks have published results for both models. Qwen2.5 Plus 1127 has 14 scored results on Noometry and Qwen3.5-Flash has 32.