Model comparison
Mistral vs Step 3.5 Flash
Step 3.5 Flash is the stronger model overall, scoring 41.7 to 29.4 on the Noometry Index.
Last verified . 17 shared benchmarks.
Mistral AI
StepFunSummary
- They share 17 benchmarks with published results for both. Mistral scores higher in 1 category and Step 3.5 Flash in 7 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Step 3.5 Flash leads 39.0 to 16.3.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Mistral | Step 3.5 Flash | |
|---|---|---|
| Provider | Mistral AI | StepFun |
| Noometry Index | 29.4 | 41.7 |
| Released | — | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 22 | 19 |
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Category by category
Coding Step 3.5 Flash leads
Mistral: 33.2 (#249), Step 3.5 Flash: 41.7 (#106)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1162 | 1436 |
Reasoning Too close to call
Mistral: 21.3 (#199), Step 3.5 Flash: 21.2 (#202)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1149 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Step 3.5 Flash leads
Mistral: 20.5 (#275), Step 3.5 Flash: 40.6 (#77)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1180 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
| Omni-MATH | 7.2% | — |
Knowledge Step 3.5 Flash leads
Mistral: 16.3 (#283), Step 3.5 Flash: 39.0 (#127)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1125 | 1422 |
| MMLU-Pro | 27.7% | — |
| GPQA (HELM) | 30.3% | — |
Multilingual Step 3.5 Flash leads
Mistral: 33.0 (#249), Step 3.5 Flash: 50.7 (#115)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1129 | 1386 |
| LMArena Chinese | 1109 | 1448 |
| LMArena French | 1179 | 1421 |
| LMArena German | 1155 | 1404 |
| LMArena Japanese | 1012 | 1353 |
| LMArena Korean | 1032 | 1350 |
| LMArena Russian | 1168 | 1385 |
| LMArena Spanish | 1143 | 1419 |
Instruction Following Step 3.5 Flash leads
Mistral: 52.9 (#283), Step 3.5 Flash: 73.3 (#119)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1152 | 1385 |
| IFEval | 56.8% | — |
Long Context Step 3.5 Flash leads
Mistral: 35.0 (#240), Step 3.5 Flash: 42.8 (#112)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1154 | 1402 |
Writing & Preference Step 3.5 Flash leads
Mistral: 37.2 (#255), Step 3.5 Flash: 59.0 (#108)
| Benchmark | Mistral | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1165 | 1403 |
| LMArena Creative Writing | 1158 | 1357 |
| LMArena Multi-Turn | 1147 | 1405 |
| WildBench | 66% | — |
Frequently asked questions
Is Mistral better than Step 3.5 Flash?
Step 3.5 Flash is the stronger model overall, scoring 41.7 to 29.4 on the Noometry Index.
Is Mistral or Step 3.5 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 41.7 versus 33.2 in the Noometry coding category.
How many benchmarks do Mistral and Step 3.5 Flash share?
17 benchmarks have published results for both models. Mistral has 22 scored results on Noometry and Step 3.5 Flash has 19.