Model comparison
Devstral Small 2505 vs Qwen3.5-9B
Devstral Small 2505 and Qwen3.5-9B score almost the same on the Noometry Index (34.3 vs 33.8), so choose on price, context window or the category you care about most.
Last verified . 2 shared benchmarks.
Mistral AI
Alibaba (Qwen)Summary
- They share 2 benchmarks with published results for both. Devstral Small 2505 scores higher in 1 category and Qwen3.5-9B in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Qwen3.5-9B leads 23.1 to 19.7.
- Qwen3.5-9B is cheaper at $0.10 / $0.15 per million input/output tokens, against $0.10 / $0.30 for Devstral Small 2505.
- Qwen3.5-9B accepts more context: 262K tokens versus 128K.
Side by side
| Devstral Small 2505 | Qwen3.5-9B | |
|---|---|---|
| Provider | Mistral AI | Alibaba (Qwen) |
| Noometry Index | 34.3 | 33.8 |
| Released | 2025-05-07 | 2026-02-23 |
| Weights | Open | Open |
| Context window | 128K | 262K |
| Max output | 128K | 66K |
| Input $ / M tokens | $0.10 | $0.10 |
| Output $ / M tokens | $0.30 | $0.15 |
| Results tracked | 4 | 10 |
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Category by category
Coding Devstral Small 2505 leads
Devstral Small 2505: 38.9 (#166), Qwen3.5-9B: 35.9 (#217)
| Benchmark | Devstral Small 2505 | Qwen3.5-9B |
|---|---|---|
| SciCode | 28.8% | 27.5% |
| SWE-bench Verified (bash only) | 56.4% | — |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, Qwen3.5-9B: 14.5 (#151)
| Benchmark | Devstral Small 2505 | Qwen3.5-9B |
|---|---|---|
| Terminal-Bench | — | 9.2% |
Reasoning Qwen3.5-9B leads
Devstral Small 2505: 19.7 (#252), Qwen3.5-9B: 23.1 (#182)
| Benchmark | Devstral Small 2505 | Qwen3.5-9B |
|---|---|---|
| CritPt | 0% | 0.3% |
| Kagi LLM Benchmark | 37.7% | — |
| Chess Puzzles | — | 12% |
| DTBench | — | 71.2% |
| LMCA | — | 24.5% |
| Epoch Capabilities Index | — | 139.46 |
Math Not comparable
Devstral Small 2505: —, Qwen3.5-9B: 34.8 (#192)
| Benchmark | Devstral Small 2505 | Qwen3.5-9B |
|---|---|---|
| MathArena Final-Answer Competitions | — | 48.5% |
| OTIS Mock AIME 2024-2025 | — | 61.7% |
Knowledge Not comparable
Devstral Small 2505: —, Qwen3.5-9B: 46.0 (#84)
| Benchmark | Devstral Small 2505 | Qwen3.5-9B |
|---|---|---|
| GPQA Diamond | — | 79% |
Frequently asked questions
Is Devstral Small 2505 better than Qwen3.5-9B?
Devstral Small 2505 and Qwen3.5-9B score almost the same on the Noometry Index (34.3 vs 33.8), so choose on price, context window or the category you care about most.
Which is cheaper, Devstral Small 2505 or Qwen3.5-9B?
Qwen3.5-9B is cheaper. It lists at $0.10 per million input tokens and $0.15 per million output tokens; Devstral Small 2505 lists at $0.10 and $0.30.
Is Devstral Small 2505 or Qwen3.5-9B better for coding?
Devstral Small 2505 scores higher on coding benchmarks: 38.9 versus 35.9 in the Noometry coding category.
Which has the bigger context window?
Qwen3.5-9B does, with 262K tokens against 128K.
How many benchmarks do Devstral Small 2505 and Qwen3.5-9B share?
2 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Qwen3.5-9B has 10.