Model comparison
MiMo-V2-Flash vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 41.3 on the Noometry Index. MiMo-V2-Flash costs 8.1× less per token, which makes it the better buy when Step 5 Preview's lead doesn't matter for your workload.
Last verified . 16 shared benchmarks.
StepFunSummary
- They share 16 benchmarks with published results for both. MiMo-V2-Flash scores higher in 0 categories and Step 5 Preview in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Step 5 Preview leads 51.8 to 36.1.
- The biggest single-benchmark swing is SciCode: 25.9% for MiMo-V2-Flash and 58.9% for Step 5 Preview.
- MiMo-V2-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- Step 5 Preview accepts more context: 1.02M tokens versus 262K.
- MiMo-V2-Flash has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2-Flash | Step 5 Preview | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 41.3 | 47.9 |
| Released | 2025-12-16 | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | 262K | 1.02M |
| Max output | 66K | 66K |
| Input $ / M tokens | $0.14 | $1 |
| Output $ / M tokens | $0.28 | $2.70 |
| Results tracked | 21 | 18 |
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Category by category
Coding Step 5 Preview leads
MiMo-V2-Flash: 36.1 (#211), Step 5 Preview: 51.8 (#36)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1330 | 1564 |
| SciCode | 25.9% | 58.9% |
| LMArena Coding | 1443 | 1480 |
| ALE-Bench | 737.95 | — |
Reasoning Step 5 Preview leads
MiMo-V2-Flash: 24.9 (#157), Step 5 Preview: 40.0 (#57)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| CritPt | 0% | 20.9% |
| LMArena Hard Prompts | 1420 | 1465 |
Math Step 5 Preview leads
MiMo-V2-Flash: 38.3 (#139), Step 5 Preview: 46.1 (#72)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Math | 1396 | 1470 |
| ProofBench | — | 42% |
Knowledge Step 5 Preview leads
MiMo-V2-Flash: 39.7 (#131), Step 5 Preview: 41.2 (#112)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1425 | 1470 |
Multimodal Not comparable
MiMo-V2-Flash: —, Step 5 Preview: 41.0 (#41)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
MiMo-V2-Flash: 51.0 (#113), Step 5 Preview: 53.8 (#54)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1392 | 1432 |
| LMArena Chinese | 1462 | 1519 |
| LMArena Russian | 1387 | 1436 |
| LMArena Spanish | 1420 | 1439 |
| LMArena French | 1429 | — |
| LMArena German | 1395 | — |
| LMArena Japanese | 1325 | — |
| LMArena Korean | 1358 | — |
Instruction Following Step 5 Preview leads
MiMo-V2-Flash: 73.5 (#120), Step 5 Preview: 76.0 (#50)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1392 | 1444 |
Long Context Step 5 Preview leads
MiMo-V2-Flash: 43.0 (#110), Step 5 Preview: 44.5 (#64)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1409 | 1455 |
Writing & Preference Step 5 Preview leads
MiMo-V2-Flash: 59.7 (#106), Step 5 Preview: 62.8 (#71)
| Benchmark | MiMo-V2-Flash | Step 5 Preview |
|---|---|---|
| LMArena Text | 1411 | 1442 |
| LMArena Creative Writing | 1375 | 1410 |
| LMArena Multi-Turn | 1404 | 1447 |
Frequently asked questions
Is MiMo-V2-Flash better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 41.3 on the Noometry Index. MiMo-V2-Flash costs 8.1× less per token, which makes it the better buy when Step 5 Preview's lead doesn't matter for your workload.
Which is cheaper, MiMo-V2-Flash or Step 5 Preview?
MiMo-V2-Flash is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; Step 5 Preview lists at $1 and $2.70.
Is MiMo-V2-Flash or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 36.1 in the Noometry coding category.
Which has the bigger context window?
Step 5 Preview does, with 1.02M tokens against 262K.
How many benchmarks do MiMo-V2-Flash and Step 5 Preview share?
16 benchmarks have published results for both models. MiMo-V2-Flash has 21 scored results on Noometry and Step 5 Preview has 18.