Model comparison
Devstral Small 2505 vs o1
o1 is the stronger model overall, scoring 40.9 to 34.3 on the Noometry Index. Devstral Small 2505 costs 175× less per token, which makes it the better buy when o1's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in reasoning, where o1 leads 27.9 to 19.7.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $15 / $60 for o1.
- o1 accepts more context: 200K tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | o1 | |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 34.3 | 40.9 |
| Released | 2025-05-07 | 2024-09-12 |
| Weights | Open | Proprietary |
| Context window | 128K | 200K |
| Max output | 128K | 100K |
| Input $ / M tokens | $0.10 | $15 |
| Output $ / M tokens | $0.30 | $60 |
| Results tracked | 4 | 52 |
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Category by category
Coding o1 leads
Devstral Small 2505: 38.9 (#166), o1: 46.1 (#70)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| Aider Polyglot | — | 61.7% |
| SciCode | 28.8% | — |
| WeirdML | — | 47.6% |
| LiveBench Coding | — | 69.7% |
| LMArena Coding | — | 1367 |
| CadEval | — | 56% |
| HumanEval+ | — | 89% |
| MBPP+ | — | 80.2% |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, o1: 24.6 (#117)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| Cybench | — | 10% |
| METR Time Horizons | — | 51.1% |
Reasoning o1 leads
Devstral Small 2505: 19.7 (#252), o1: 27.9 (#111)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| SimpleBench | — | 41.7% |
| Kagi LLM Benchmark | 37.7% | — |
| ARC-AGI-1 | — | 30.7% |
| CritPt | 0% | — |
| Chess Puzzles | — | 15% |
| EnigmaEval | — | 5.7% |
| LiveBench Reasoning | — | 91.6% |
| LMArena Hard Prompts | — | 1371 |
| DTBench | — | 74.7% |
| LiveBench Data Analysis | — | 65.5% |
| LMCA | — | 22.3% |
| Epoch Capabilities Index | — | 141.91 |
| LiveBench | — | 75.7% |
Math Not comparable
Devstral Small 2505: —, o1: 36.1 (#175)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 14.7% |
| OTIS Mock AIME 2024-2025 | — | 73.3% |
| LiveBench Math | — | 80.3% |
| LMArena Math | — | 1388 |
| MATH Level 5 | — | 94.7% |
| FrontierMath (Feb 2025 set) | — | 9.3% |
Knowledge Not comparable
Devstral Small 2505: —, o1: 41.5 (#110)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| GPQA Diamond | — | 76.8% |
| Humanity's Last Exam | — | 8% |
| SimpleQA Verified | — | 41.1% |
| Confabulations | — | 11.7% |
| LMArena Expert | — | 1361 |
Multimodal Not comparable
Devstral Small 2505: —, o1: 34.2 (#93)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| LMArena Vision | — | 1168 |
| GeoBench | — | 80% |
| VPCT | — | 37% |
| SpatialViz-Bench | — | 41.4% |
Multilingual Not comparable
Devstral Small 2505: —, o1: 48.6 (#142)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| LMArena Non-English | — | 1358 |
| LMArena Chinese | — | 1394 |
| LMArena French | — | 1344 |
| LMArena German | — | 1337 |
| LMArena Japanese | — | 1346 |
| LMArena Korean | — | 1396 |
| LMArena Russian | — | 1356 |
| LMArena Spanish | — | 1345 |
Instruction Following Not comparable
Devstral Small 2505: —, o1: 74.8 (#86)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| LiveBench Instruction Following | — | 81.5% |
| LMArena Instruction Following | — | 1367 |
Long Context Not comparable
Devstral Small 2505: —, o1: 50.3 (#9)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| Fiction.LiveBench | — | 83.3% |
| LMArena Longer Query | — | 1378 |
Writing & Preference Not comparable
Devstral Small 2505: —, o1: 55.6 (#144)
| Benchmark | Devstral Small 2505 | o1 |
|---|---|---|
| LMArena Text | — | 1366 |
| LMArena Creative Writing | — | 1348 |
| Short-Story Creative Writing | — | 70.2% |
| LMArena Multi-Turn | — | 1369 |
| LiveBench Language | — | 65.4% |
Frequently asked questions
Is Devstral Small 2505 better than o1?
o1 is the stronger model overall, scoring 40.9 to 34.3 on the Noometry Index. Devstral Small 2505 costs 175× less per token, which makes it the better buy when o1's lead doesn't matter for your workload.
Which is cheaper, Devstral Small 2505 or o1?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; o1 lists at $15 and $60.
Is Devstral Small 2505 or o1 better for coding?
o1 scores higher on coding benchmarks: 46.1 versus 38.9 in the Noometry coding category.
Which has the bigger context window?
o1 does, with 200K tokens against 128K.
How many benchmarks do Devstral Small 2505 and o1 share?
0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and o1 has 52.