Model comparison
Devstral Small 2505 vs Step 3.7 Flash
Step 3.7 Flash is the stronger model overall, scoring 37.3 to 34.3 on the Noometry Index. Devstral Small 2505 costs 2.8× less per token, which makes it the better buy when Step 3.7 Flash's lead doesn't matter for your workload.
Last verified . 2 shared benchmarks.
Mistral AI
StepFunSummary
- They share 2 benchmarks with published results for both. Devstral Small 2505 scores higher in 0 categories and Step 3.7 Flash in 2 categories; 2 gaps are clear of the uncertainty.
- The biggest single-benchmark swing is SciCode: 28.8% for Devstral Small 2505 and 40% for Step 3.7 Flash.
- Devstral Small 2505 is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.18 / $1.11 for Step 3.7 Flash.
- Step 3.7 Flash accepts more context: 256K tokens versus 128K.
Side by side
| Devstral Small 2505 | Step 3.7 Flash | |
|---|---|---|
| Provider | Mistral AI | StepFun |
| Noometry Index | 34.3 | 37.3 |
| Released | 2025-05-07 | 2026-05-29 |
| Weights | Open | Open |
| Context window | 128K | 256K |
| Max output | 128K | 256K |
| Input $ / M tokens | $0.10 | $0.18 |
| Output $ / M tokens | $0.30 | $1.11 |
| Results tracked | 4 | 5 |
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Category by category
Coding Step 3.7 Flash leads
Devstral Small 2505: 38.9 (#166), Step 3.7 Flash: 40.0 (#150)
| Benchmark | Devstral Small 2505 | Step 3.7 Flash |
|---|---|---|
| SciCode | 28.8% | 40% |
| SWE-bench Verified (bash only) | 56.4% | — |
| ALE-Bench | — | 694.12 |
Reasoning Step 3.7 Flash leads
Devstral Small 2505: 19.7 (#252), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Devstral Small 2505 | Step 3.7 Flash |
|---|---|---|
| CritPt | 0% | 2.3% |
| Kagi LLM Benchmark | 37.7% | — |
| NYT Connections (extended) | — | 39.7% |
Math Not comparable
Devstral Small 2505: —, Step 3.7 Flash: 42.9 (#82)
| Benchmark | Devstral Small 2505 | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
Frequently asked questions
Is Devstral Small 2505 better than Step 3.7 Flash?
Step 3.7 Flash is the stronger model overall, scoring 37.3 to 34.3 on the Noometry Index. Devstral Small 2505 costs 2.8× less per token, which makes it the better buy when Step 3.7 Flash's lead doesn't matter for your workload.
Which is cheaper, Devstral Small 2505 or Step 3.7 Flash?
Devstral Small 2505 is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Step 3.7 Flash lists at $0.18 and $1.11.
Is Devstral Small 2505 or Step 3.7 Flash better for coding?
Step 3.7 Flash scores higher on coding benchmarks: 40.0 versus 38.9 in the Noometry coding category.
Which has the bigger context window?
Step 3.7 Flash does, with 256K tokens against 128K.
How many benchmarks do Devstral Small 2505 and Step 3.7 Flash share?
2 benchmarks have published results for both models. Devstral Small 2505 has 4 scored results on Noometry and Step 3.7 Flash has 5.