Model comparison
Claude Opus 4.1 vs Devstral Small 2505
Claude Opus 4.1 is the stronger model overall, scoring 41.0 to 34.3 on the Noometry Index. Devstral Small 2505 costs 200× less per token, which makes it the better buy when Claude Opus 4.1's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in reasoning, where Claude Opus 4.1 leads 32.2 to 19.7.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
- Claude Opus 4.1 accepts more context: 200K tokens versus 128K.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 4.1 | Devstral Small 2505 | |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Noometry Index | 41.0 | 34.3 |
| Released | 2025-08-05 | 2025-05-07 |
| Weights | Proprietary | Open |
| Context window | 200K | 128K |
| Max output | 32K | 128K |
| Input $ / M tokens | $15 | $0.10 |
| Output $ / M tokens | $75 | $0.30 |
| Results tracked | 48 | 4 |
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Category by category
Coding Claude Opus 4.1 leads
Claude Opus 4.1: 44.4 (#73), Devstral Small 2505: 38.9 (#166)
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| SWE-bench Verified | 73.3% | — |
| SWE-bench Verified (bash only) | — | 56.4% |
| LMArena WebDev | 1390 | — |
| SciCode | — | 28.8% |
| WeirdML | 45.9% | — |
| LMArena Coding | 1479 | — |
| ALE-Bench | 674.77 | — |
| AlgoTune | 1.34 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.1: 35.0 (#41), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| Terminal-Bench | 38% | — |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |
Reasoning Claude Opus 4.1 leads
Claude Opus 4.1: 32.2 (#76), Devstral Small 2505: 19.7 (#252)
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| SimpleBench | 60% | — |
| Kagi LLM Benchmark | — | 37.7% |
| CritPt | — | 0% |
| Chess Puzzles | 7% | — |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| LMArena Hard Prompts | 1443 | — |
| Mystery Game Puzzles | 21% | — |
| DTBench | 80% | — |
| LMCA | 37.1% | — |
| Epoch Capabilities Index | 144.12 | — |
| ForecastBench | 62 | — |
Math Not comparable
Claude Opus 4.1: 22.3 (#277), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 12.6% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.9% | — |
| LMArena Math | 1431 | — |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Not comparable
Claude Opus 4.1: 42.0 (#101), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| GPQA Diamond | 77.3% | — |
| Humanity's Last Exam | 11.5% | — |
| Confabulations | 17.1% | — |
| Vectara Hallucination Rate | 11.8% | — |
| LMArena Expert | 1439 | — |
Multimodal Not comparable
Claude Opus 4.1: 26.8 (#119), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| VPCT | 35% | — |
Multilingual Not comparable
Claude Opus 4.1: 52.0 (#95), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| LMArena Non-English | 1405 | — |
| LMArena Chinese | 1427 | — |
| LMArena French | 1431 | — |
| LMArena German | 1413 | — |
| LMArena Japanese | 1378 | — |
| LMArena Korean | 1380 | — |
| LMArena Russian | 1422 | — |
| LMArena Spanish | 1448 | — |
Instruction Following Not comparable
Claude Opus 4.1: 75.6 (#58), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| LMArena Instruction Following | 1435 | — |
Long Context Not comparable
Claude Opus 4.1: 44.5 (#63), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| LMArena Longer Query | 1455 | — |
Writing & Preference Not comparable
Claude Opus 4.1: 62.4 (#74), Devstral Small 2505: —
| Benchmark | Claude Opus 4.1 | Devstral Small 2505 |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1412 | — |
| Short-Story Creative Writing | 84.7% | — |
| LMArena Multi-Turn | 1444 | — |
Frequently asked questions
Is Claude Opus 4.1 better than Devstral Small 2505?
Claude Opus 4.1 is the stronger model overall, scoring 41.0 to 34.3 on the Noometry Index. Devstral Small 2505 costs 200× less per token, which makes it the better buy when Claude Opus 4.1's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.1 or Devstral Small 2505?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Claude Opus 4.1 lists at $15 and $75.
Is Claude Opus 4.1 or Devstral Small 2505 better for coding?
Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 38.9 in the Noometry coding category.
Which has the bigger context window?
Claude Opus 4.1 does, with 200K tokens against 128K.
How many benchmarks do Claude Opus 4.1 and Devstral Small 2505 share?
0 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Devstral Small 2505 has 4.