Model comparison
Devstral Small 2505 vs Qwen3.5-Flash
Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 34.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Mistral AI
Alibaba (Qwen)Summary
- The widest gap is in reasoning, where Qwen3.5-Flash leads 33.7 to 19.7.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.10 / $0.40 for Qwen3.5-Flash.
- Qwen3.5-Flash accepts more context: 1M tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | Qwen3.5-Flash | |
|---|---|---|
| Provider | Mistral AI | Alibaba (Qwen) |
| Noometry Index | 34.3 | 42.5 |
| Released | 2025-05-07 | 2026-02-23 |
| Weights | Open | Proprietary |
| Context window | 128K | 1M |
| Max output | 128K | 66K |
| Input $ / M tokens | $0.10 | $0.10 |
| Output $ / M tokens | $0.30 | $0.40 |
| Results tracked | 4 | 32 |
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Category by category
Coding Devstral Small 2505 leads
Devstral Small 2505: 38.9 (#166), Qwen3.5-Flash: 34.2 (#242)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1244 |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1412 |
| ALE-Bench | — | 221.8 |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: —
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| Vending-Bench 2 | — | 462.69 |
Reasoning Qwen3.5-Flash leads
Devstral Small 2505: 19.7 (#252), Qwen3.5-Flash: 33.7 (#72)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |
| Chess Puzzles | — | 21% |
| LMArena Hard Prompts | — | 1403 |
| Mystery Game Puzzles | — | 20% |
| DTBench | — | 82.9% |
| LMCA | — | 29.1% |
| Epoch Capabilities Index | — | 143.98 |
Math Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: 37.4 (#158)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 18.2% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| LMArena Math | — | 1407 |
| FrontierMath (Feb 2025 set) | — | 6.2% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: 43.2 (#93)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| GPQA Diamond | — | 82.3% |
| SimpleQA Verified | — | 20.3% |
| Vectara Hallucination Rate | — | 10.5% |
| LMArena Expert | — | 1407 |
Multilingual Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: 50.5 (#121)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| LMArena Non-English | — | 1385 |
| LMArena Chinese | — | 1446 |
| LMArena French | — | 1412 |
| LMArena German | — | 1390 |
| LMArena Japanese | — | 1368 |
| LMArena Korean | — | 1344 |
| LMArena Russian | — | 1379 |
| LMArena Spanish | — | 1400 |
Instruction Following Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: 72.6 (#139)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1374 |
Long Context Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: 42.4 (#124)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| LMArena Longer Query | — | 1392 |
Writing & Preference Not comparable
Devstral Small 2505: —, Qwen3.5-Flash: 57.9 (#122)
| Benchmark | Devstral Small 2505 | Qwen3.5-Flash |
|---|---|---|
| LMArena Text | — | 1397 |
| LMArena Creative Writing | — | 1343 |
| LMArena Multi-Turn | — | 1393 |
Frequently asked questions
Is Devstral Small 2505 better than Qwen3.5-Flash?
Qwen3.5-Flash is the stronger model overall, scoring 42.5 to 34.3 on the Noometry Index.
Which is cheaper, Devstral Small 2505 or Qwen3.5-Flash?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Qwen3.5-Flash lists at $0.10 and $0.40.
Is Devstral Small 2505 or Qwen3.5-Flash better for coding?
Devstral Small 2505 scores higher on coding benchmarks: 38.9 versus 34.2 in the Noometry coding category.
Which has the bigger context window?
Qwen3.5-Flash does, with 1M tokens against 128K.
How many benchmarks do Devstral Small 2505 and Qwen3.5-Flash share?
0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Qwen3.5-Flash has 32.