Model comparison
Devstral Small 2505 vs GPT-4.1
GPT-4.1 is the stronger model overall, scoring 35.9 to 34.3 on the Noometry Index. Devstral Small 2505 costs 23× less per token, which makes it the better buy when GPT-4.1's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Mistral AISummary
- They share 2 benchmarks with published results for both. Devstral Small 2505 scores higher in 2 categories and GPT-4.1 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Devstral Small 2505 leads 19.7 to 11.7.
- The biggest single-benchmark swing is SWE-bench Verified (bash only): 56.4% for Devstral Small 2505 and 39.6% for GPT-4.1.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $2 / $8 for GPT-4.1.
- GPT-4.1 accepts more context: 1.05M tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | GPT-4.1 | |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 34.3 | 35.9 |
| Released | 2025-05-07 | 2025-04-14 |
| Weights | Open | Proprietary |
| Context window | 128K | 1.05M |
| Max output | 128K | 33K |
| Input $ / M tokens | $0.10 | $2 |
| Output $ / M tokens | $0.30 | $8 |
| Results tracked | 4 | 52 |
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Category by category
Coding Devstral Small 2505 leads
Devstral Small 2505: 38.9 (#166), GPT-4.1: 34.4 (#238)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | 39.6% |
| SWE-bench Verified | — | 48.5% |
| Aider Polyglot | — | 52.4% |
| SciCode | 28.8% | — |
| WeirdML | — | 39% |
| LMArena Coding | — | 1391 |
| CadEval | — | 42% |
| ALE-Bench | — | 558.1 |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, GPT-4.1: 34.7 (#43)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 54% |
Reasoning Devstral Small 2505 leads
Devstral Small 2505: 19.7 (#252), GPT-4.1: 11.7 (#339)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | 52.3% |
| ARC-AGI-2 | — | 0.4% |
| SimpleBench | — | 27% |
| ARC-AGI-1 | — | 5.5% |
| CritPt | 0% | — |
| Chess Puzzles | — | 6% |
| EnigmaEval | — | 2.2% |
| LMArena Hard Prompts | — | 1384 |
| DTBench | — | 68.3% |
| LMCA | — | 25.6% |
| Epoch Capabilities Index | — | 136.78 |
| ForecastBench | — | 61.5 |
Math Not comparable
Devstral Small 2505: —, GPT-4.1: 22.3 (#280)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 6% |
| OTIS Mock AIME 2024-2025 | — | 38.3% |
| Omni-MATH | — | 47.1% |
| LMArena Math | — | 1370 |
| MATH Level 5 | — | 83% |
| FrontierMath (Feb 2025 set) | — | 5.5% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Not comparable
Devstral Small 2505: —, GPT-4.1: 37.1 (#160)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| GPQA Diamond | — | 66.9% |
| Humanity's Last Exam | — | 5.4% |
| SimpleQA Verified | — | 31.1% |
| MMLU-Pro | — | 81.1% |
| Vectara Hallucination Rate | — | 5.6% |
| GPQA (HELM) | — | 65.9% |
| LMArena Expert | — | 1364 |
Multimodal Not comparable
Devstral Small 2505: —, GPT-4.1: 38.2 (#67)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| LMArena Vision | — | 1211 |
| GeoBench | — | 72% |
Multilingual Not comparable
Devstral Small 2505: —, GPT-4.1: 49.4 (#133)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| LMArena Non-English | — | 1370 |
| LMArena Chinese | — | 1382 |
| LMArena French | — | 1382 |
| LMArena German | — | 1381 |
| LMArena Japanese | — | 1319 |
| LMArena Korean | — | 1339 |
| LMArena Russian | — | 1377 |
| LMArena Spanish | — | 1376 |
Instruction Following Not comparable
Devstral Small 2505: —, GPT-4.1: 71.3 (#153)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| IFEval | — | 83.8% |
| LMArena Instruction Following | — | 1367 |
Long Context Not comparable
Devstral Small 2505: —, GPT-4.1: 40.0 (#163)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| Fiction.LiveBench | — | 63.9% |
| LMArena Longer Query | — | 1385 |
Writing & Preference Not comparable
Devstral Small 2505: —, GPT-4.1: 57.6 (#125)
| Benchmark | Devstral Small 2505 | GPT-4.1 |
|---|---|---|
| LMArena Text | — | 1383 |
| LMArena Creative Writing | — | 1363 |
| EQ-Bench Creative Writing | — | 1420 |
| WildBench | — | 85.4% |
| LMArena Multi-Turn | — | 1398 |
Frequently asked questions
Is Devstral Small 2505 better than GPT-4.1?
GPT-4.1 is the stronger model overall, scoring 35.9 to 34.3 on the Noometry Index. Devstral Small 2505 costs 23× less per token, which makes it the better buy when GPT-4.1's lead doesn't matter for your workload.
Which is cheaper, Devstral Small 2505 or GPT-4.1?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; GPT-4.1 lists at $2 and $8.
Is Devstral Small 2505 or GPT-4.1 better for coding?
Devstral Small 2505 scores higher on coding benchmarks: 38.9 versus 34.4 in the Noometry coding category.
Which has the bigger context window?
GPT-4.1 does, with 1.05M tokens against 128K.
How many benchmarks do Devstral Small 2505 and GPT-4.1 share?
2 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and GPT-4.1 has 52.