Model comparison
Devstral Small 2505 vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 34.3 on the Noometry Index.
Last verified . 1 shared benchmarks.
Mistral AISummary
- They share 1 benchmark with published results for both. Devstral Small 2505 scores higher in 1 category and Grok 4 Fast in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Devstral Small 2505 leads 38.9 to 32.5.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 37.7% for Devstral Small 2505 and 66.1% for Grok 4 Fast.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | Grok 4 Fast | |
|---|---|---|
| Provider | Mistral AI | xAI |
| Noometry Index | 34.3 | 39.4 |
| Released | 2025-05-07 | 2025-09-19 |
| Weights | Open | Proprietary |
| Context window | 128K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.30 | — |
| Results tracked | 4 | 30 |
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Category by category
Coding Devstral Small 2505 leads
Devstral Small 2505: 38.9 (#166), Grok 4 Fast: 32.5 (#271)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1159 |
| SciCode | 28.8% | — |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Grok 4 Fast leads
Devstral Small 2505: 19.7 (#252), Grok 4 Fast: 22.2 (#201)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | 66.1% |
| ARC-AGI-2 | — | 5.3% |
| ARC-AGI-1 | — | 48.5% |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1412 |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.2 |
| ForecastBench | — | 60.5 |
Math Not comparable
Devstral Small 2505: —, Grok 4 Fast: 38.9 (#123)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Math | — | 1419 |
Knowledge Not comparable
Devstral Small 2505: —, Grok 4 Fast: 32.0 (#214)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |
Multilingual Not comparable
Devstral Small 2505: —, Grok 4 Fast: 51.3 (#111)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1396 |
| LMArena Chinese | — | 1457 |
| LMArena French | — | 1431 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1357 |
| LMArena Russian | — | 1389 |
| LMArena Spanish | — | 1415 |
Instruction Following Not comparable
Devstral Small 2505: —, Grok 4 Fast: 73.2 (#121)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1387 |
Long Context Not comparable
Devstral Small 2505: —, Grok 4 Fast: 63.2 (#3)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |
Writing & Preference Not comparable
Devstral Small 2505: —, Grok 4 Fast: 60.0 (#102)
| Benchmark | Devstral Small 2505 | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1387 |
| LMArena Multi-Turn | — | 1414 |
Frequently asked questions
Is Devstral Small 2505 better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 34.3 on the Noometry Index.
Is Devstral Small 2505 or Grok 4 Fast better for coding?
Devstral Small 2505 scores higher on coding benchmarks: 38.9 versus 32.5 in the Noometry coding category.
How many benchmarks do Devstral Small 2505 and Grok 4 Fast share?
1 benchmark has published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Grok 4 Fast has 30.