Model comparison
MiMo-V2.5 vs Step 5 Preview
MiMo-V2.5 and Step 5 Preview score almost the same on the Noometry Index (43.0 vs 43.8), so choose on price, context window or the category you care about most.
Last verified . 3 shared benchmarks.
StepFunSummary
- They share 3 benchmarks with published results for both. MiMo-V2.5 scores higher in 0 categories and Step 5 Preview in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 38.0 to 27.8.
- The biggest single-benchmark swing is CritPt: 3.7% for MiMo-V2.5 and 20.9% for Step 5 Preview.
- MiMo-V2.5 is cheaper at $0.14 / $0.28 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- MiMo-V2.5 accepts more context: 1.05M tokens versus 1.02M.
- MiMo-V2.5 has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2.5 | Step 5 Preview | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 43.0 | 43.8 |
| Released | 2026-04-22 | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 1.02M |
| Max output | 131K | 66K |
| Input $ / M tokens | $0.14 | $1 |
| Output $ / M tokens | $0.28 | $2.70 |
| Results tracked | 23 | 3 |
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Category by category
Coding Step 5 Preview leads
MiMo-V2.5: 43.6 (#75), Step 5 Preview: 50.6 (#40)
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1438 | 1569 |
| SciCode | 43.1% | 58.9% |
| LMArena Coding | 1469 | — |
| ALE-Bench | 513.95 | — |
Reasoning Step 5 Preview leads
MiMo-V2.5: 27.8 (#98), Step 5 Preview: 38.0 (#58)
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| CritPt | 3.7% | 20.9% |
| LMArena Hard Prompts | 1450 | — |
Math Not comparable
MiMo-V2.5: 35.4 (#145), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| ProofBench | 16% | — |
| LMArena Math | 1436 | — |
Knowledge Not comparable
MiMo-V2.5: 40.2 (#109), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1459 | — |
Multimodal Not comparable
MiMo-V2.5: 39.0 (#53), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1245 | — |
Multilingual Not comparable
MiMo-V2.5: 52.0 (#96), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1404 | — |
| LMArena Chinese | 1467 | — |
| LMArena French | 1447 | — |
| LMArena German | 1421 | — |
| LMArena Japanese | 1304 | — |
| LMArena Korean | 1363 | — |
| LMArena Russian | 1395 | — |
| LMArena Spanish | 1412 | — |
Instruction Following Not comparable
MiMo-V2.5: 75.7 (#55), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1433 | — |
Long Context Not comparable
MiMo-V2.5: 44.1 (#69), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1444 | — |
Writing & Preference Not comparable
MiMo-V2.5: 61.8 (#82), Step 5 Preview: —
| Benchmark | MiMo-V2.5 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1427 | — |
| LMArena Creative Writing | 1392 | — |
| LMArena Multi-Turn | 1445 | — |
Frequently asked questions
Is MiMo-V2.5 better than Step 5 Preview?
MiMo-V2.5 and Step 5 Preview score almost the same on the Noometry Index (43.0 vs 43.8), so choose on price, context window or the category you care about most.
Which is cheaper, MiMo-V2.5 or Step 5 Preview?
MiMo-V2.5 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-V2.5 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 50.6 versus 43.6 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.5 does, with 1.05M tokens against 1.02M.
How many benchmarks do MiMo-V2.5 and Step 5 Preview share?
3 benchmarks have published results for both models. MiMo-V2.5 has 23 scored results on Noometry and Step 5 Preview has 3.