Model comparison
Devstral Small 2505 vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 34.3 on the Noometry Index. Devstral Small 2505 costs 1.8× less per token, which makes it the better buy when Grok 4.1 Fast's lead doesn't matter for your workload.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 19.7.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.20 / $0.50 for Grok 4.1 Fast.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | Grok 4.1 Fast | |
|---|---|---|
| Provider | Mistral AI | xAI |
| Noometry Index | 34.3 | 41.4 |
| Released | 2025-05-07 | 2025-06-27 |
| Weights | Open | Proprietary |
| Context window | 128K | 128K |
| Max output | 128K | 30K |
| Input $ / M tokens | $0.10 | $0.20 |
| Output $ / M tokens | $0.30 | $0.50 |
| Results tracked | 4 | 32 |
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Category by category
Coding Devstral Small 2505 leads
Devstral Small 2505: 38.9 (#166), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| LMArena WebDev | — | 1242 |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1411 |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 36.3 (#39)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Devstral Small 2505: 19.7 (#252), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 37.7% | — |
| NYT Connections (extended) | — | 87.4% |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1407 |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |
Math Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 31.9 (#221)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |
| LMArena Math | — | 1408 |
Knowledge Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 33.1 (#207)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | — | 17.8% |
| LMArena Expert | — | 1399 |
Multimodal Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 37.0 (#76)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |
Multilingual Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 51.0 (#114)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | — | 1391 |
| LMArena Chinese | — | 1441 |
| LMArena French | — | 1415 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1349 |
| LMArena Korean | — | 1361 |
| LMArena Russian | — | 1387 |
| LMArena Spanish | — | 1413 |
Instruction Following Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 72.7 (#133)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1376 |
Long Context Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 42.4 (#126)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | — | 1390 |
Writing & Preference Not comparable
Devstral Small 2505: —, Grok 4.1 Fast: 57.2 (#131)
| Benchmark | Devstral Small 2505 | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | — | 1408 |
| LMArena Creative Writing | — | 1394 |
| EQ-Bench Creative Writing | — | 1327 |
| LMArena Multi-Turn | — | 1389 |
Frequently asked questions
Is Devstral Small 2505 better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 34.3 on the Noometry Index. Devstral Small 2505 costs 1.8× less per token, which makes it the better buy when Grok 4.1 Fast's lead doesn't matter for your workload.
Which is cheaper, Devstral Small 2505 or Grok 4.1 Fast?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Grok 4.1 Fast lists at $0.20 and $0.50.
Is Devstral Small 2505 or Grok 4.1 Fast better for coding?
Devstral Small 2505 scores higher on coding benchmarks: 38.9 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Both accept 128K tokens.
How many benchmarks do Devstral Small 2505 and Grok 4.1 Fast share?
0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Grok 4.1 Fast has 32.