Model comparison
Devstral Small 2505 vs Qwen3.5 Plus
Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 34.3 on the Noometry Index. Devstral Small 2505 costs 6.0× less per token, which makes it the better buy when Qwen3.5 Plus's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AI
Alibaba (Qwen)Summary
- The widest gap is in reasoning, where Qwen3.5 Plus leads 32.8 to 19.7.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.40 / $2.40 for Qwen3.5 Plus.
- Qwen3.5 Plus 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 Plus | |
|---|---|---|
| Provider | Mistral AI | Alibaba (Qwen) |
| Noometry Index | 34.3 | 42.9 |
| Released | 2025-05-07 | 2026-02-16 |
| Weights | Open | Proprietary |
| Context window | 128K | 1M |
| Max output | 128K | 66K |
| Input $ / M tokens | $0.10 | $0.40 |
| Output $ / M tokens | $0.30 | $2.40 |
| Results tracked | 4 | 15 |
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Category by category
Coding Not comparable
Devstral Small 2505: 38.9 (#166), Qwen3.5 Plus: —
| Benchmark | Devstral Small 2505 | Qwen3.5 Plus |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| SciCode | 28.8% | — |
| ALE-Bench | — | 621.92 |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, Qwen3.5 Plus: —
| Benchmark | Devstral Small 2505 | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | — | 0.54 |
Reasoning Qwen3.5 Plus leads
Devstral Small 2505: 19.7 (#252), Qwen3.5 Plus: 32.8 (#74)
| Benchmark | Devstral Small 2505 | Qwen3.5 Plus |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |
| Chess Puzzles | — | 22% |
| Mystery Game Puzzles | — | 17% |
| DTBench | — | 80.5% |
| LMCA | — | 36.4% |
| Epoch Capabilities Index | — | 146.78 |
Math Not comparable
Devstral Small 2505: —, Qwen3.5 Plus: 49.6 (#61)
| Benchmark | Devstral Small 2505 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 86.7% |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Not comparable
Devstral Small 2505: —, Qwen3.5 Plus: 46.0 (#83)
| Benchmark | Devstral Small 2505 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | — | 84.8% |
| SimpleQA Verified | — | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
Long Context Not comparable
Devstral Small 2505: —, Qwen3.5 Plus: 43.0 (#113)
| Benchmark | Devstral Small 2505 | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
Frequently asked questions
Is Devstral Small 2505 better than Qwen3.5 Plus?
Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 34.3 on the Noometry Index. Devstral Small 2505 costs 6.0× less per token, which makes it the better buy when Qwen3.5 Plus's lead doesn't matter for your workload.
Which is cheaper, Devstral Small 2505 or Qwen3.5 Plus?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Qwen3.5 Plus lists at $0.40 and $2.40.
Which has the bigger context window?
Qwen3.5 Plus does, with 1M tokens against 128K.
How many benchmarks do Devstral Small 2505 and Qwen3.5 Plus share?
0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Qwen3.5 Plus has 15.