Model comparison
MiMo-V2.5 vs Step 3.5 Flash
MiMo-V2.5 is the stronger model overall, scoring 43.0 to 41.7 on the Noometry Index.
Last verified . 17 shared benchmarks.
StepFunSummary
- They share 17 benchmarks with published results for both. MiMo-V2.5 scores higher in 7 categories and Step 3.5 Flash in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where MiMo-V2.5 leads 27.8 to 21.2.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.14 / $0.28 for MiMo-V2.5.
- MiMo-V2.5 accepts more context: 1.05M tokens versus 256K.
Side by side
| MiMo-V2.5 | Step 3.5 Flash | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 43.0 | 41.7 |
| Released | 2026-04-22 | 2026-01-29 |
| Weights | Open | Open |
| Context window | 1.05M | 256K |
| Max output | 131K | 256K |
| Input $ / M tokens | $0.14 | $0.10 |
| Output $ / M tokens | $0.28 | $0.30 |
| Results tracked | 23 | 19 |
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Category by category
Coding MiMo-V2.5 leads
MiMo-V2.5: 43.6 (#75), Step 3.5 Flash: 41.7 (#106)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1469 | 1436 |
| LMArena WebDev | 1438 | — |
| SciCode | 43.1% | — |
| ALE-Bench | 513.95 | — |
Reasoning MiMo-V2.5 leads
MiMo-V2.5: 27.8 (#98), Step 3.5 Flash: 21.2 (#202)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1450 | 1411 |
| NYT Connections (extended) | — | 28.4% |
| CritPt | 3.7% | — |
Math Step 3.5 Flash leads
MiMo-V2.5: 35.4 (#145), Step 3.5 Flash: 40.6 (#77)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1436 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
| ProofBench | 16% | — |
Knowledge MiMo-V2.5 leads
MiMo-V2.5: 40.2 (#109), Step 3.5 Flash: 39.0 (#127)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1459 | 1422 |
Multimodal Not comparable
MiMo-V2.5: 39.0 (#53), Step 3.5 Flash: —
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1245 | — |
Multilingual MiMo-V2.5 leads
MiMo-V2.5: 52.0 (#96), Step 3.5 Flash: 50.7 (#115)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1404 | 1386 |
| LMArena Chinese | 1467 | 1448 |
| LMArena French | 1447 | 1421 |
| LMArena German | 1421 | 1404 |
| LMArena Japanese | 1304 | 1353 |
| LMArena Korean | 1363 | 1350 |
| LMArena Russian | 1395 | 1385 |
| LMArena Spanish | 1412 | 1419 |
Instruction Following MiMo-V2.5 leads
MiMo-V2.5: 75.7 (#55), Step 3.5 Flash: 73.3 (#119)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1433 | 1385 |
Long Context MiMo-V2.5 leads
MiMo-V2.5: 44.1 (#69), Step 3.5 Flash: 42.8 (#112)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1444 | 1402 |
Writing & Preference MiMo-V2.5 leads
MiMo-V2.5: 61.8 (#82), Step 3.5 Flash: 59.0 (#108)
| Benchmark | MiMo-V2.5 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1427 | 1403 |
| LMArena Creative Writing | 1392 | 1357 |
| LMArena Multi-Turn | 1445 | 1405 |
Frequently asked questions
Is MiMo-V2.5 better than Step 3.5 Flash?
MiMo-V2.5 is the stronger model overall, scoring 43.0 to 41.7 on the Noometry Index.
Which is cheaper, MiMo-V2.5 or Step 3.5 Flash?
Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; MiMo-V2.5 lists at $0.14 and $0.28.
Is MiMo-V2.5 or Step 3.5 Flash better for coding?
MiMo-V2.5 scores higher on coding benchmarks: 43.6 versus 41.7 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.5 does, with 1.05M tokens against 256K.
How many benchmarks do MiMo-V2.5 and Step 3.5 Flash share?
17 benchmarks have published results for both models. MiMo-V2.5 has 23 scored results on Noometry and Step 3.5 Flash has 19.