Model comparison
Devstral Small 2505 vs Step 2 16k Exp 202412
Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 34.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
Mistral AI
StepFunSummary
- The widest gap is in reasoning, where Step 2 16k Exp 202412 leads 25.9 to 19.7.
- Devstral Small 2505 has downloadable open weights; the other is API-only.
Side by side
| Devstral Small 2505 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Mistral AI | StepFun |
| Noometry Index | 34.3 | 39.2 |
| Released | 2025-05-07 | — |
| Weights | Open | Proprietary |
| Context window | 128K | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.30 | — |
| Results tracked | 4 | 12 |
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Category by category
Coding Too close to call
Devstral Small 2505: 38.9 (#166), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| SWE-bench Verified (bash only) | 56.4% | — |
| SciCode | 28.8% | — |
| LMArena Coding | — | 1316 |
Reasoning Step 2 16k Exp 202412 leads
Devstral Small 2505: 19.7 (#252), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| Kagi LLM Benchmark | 37.7% | — |
| CritPt | 0% | — |
| LMArena Hard Prompts | — | 1299 |
Math Not comparable
Devstral Small 2505: —, Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | — | 1304 |
Knowledge Not comparable
Devstral Small 2505: —, Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | — | 1279 |
Multilingual Not comparable
Devstral Small 2505: —, Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | — | 1290 |
| LMArena Chinese | — | 1331 |
| LMArena Russian | — | 1324 |
Instruction Following Not comparable
Devstral Small 2505: —, Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | — | 1287 |
Long Context Not comparable
Devstral Small 2505: —, Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | — | 1307 |
Writing & Preference Not comparable
Devstral Small 2505: —, Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | Devstral Small 2505 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | — | 1321 |
| LMArena Creative Writing | — | 1328 |
| LMArena Multi-Turn | — | 1292 |
Frequently asked questions
Is Devstral Small 2505 better than Step 2 16k Exp 202412?
Step 2 16k Exp 202412 is the stronger model overall, scoring 39.2 to 34.3 on the Noometry Index.
Is Devstral Small 2505 or Step 2 16k Exp 202412 better for coding?
They score almost the same on coding (38.9 vs 38.5); test both on your own repository before choosing.
How many benchmarks do Devstral Small 2505 and Step 2 16k Exp 202412 share?
0 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Step 2 16k Exp 202412 has 12.