Model comparison
MiMo-V2-Omni vs Step 3.5 Flash
MiMo-V2-Omni is the stronger model overall, scoring 43.6 to 42.3 on the Noometry Index.
Last verified . 17 shared benchmarks.
StepFunSummary
- They share 17 benchmarks with published results for both. MiMo-V2-Omni scores higher in 7 categories and Step 3.5 Flash in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where MiMo-V2-Omni leads 29.7 to 22.2.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.14 / $0.28 for MiMo-V2-Omni.
- MiMo-V2-Omni accepts more context: 262K tokens versus 256K.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2-Omni | Step 3.5 Flash | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 43.6 | 42.3 |
| Released | 2026-03-18 | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | 262K | 256K |
| Max output | 131K | 256K |
| Input $ / M tokens | $0.14 | $0.10 |
| Output $ / M tokens | $0.28 | $0.30 |
| Results tracked | 18 | 19 |
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Category by category
Coding Too close to call
MiMo-V2-Omni: 43.3 (#89), Step 3.5 Flash: 42.4 (#105)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1466 | 1436 |
Reasoning MiMo-V2-Omni leads
MiMo-V2-Omni: 29.7 (#88), Step 3.5 Flash: 22.2 (#202)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1445 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Step 3.5 Flash leads
MiMo-V2-Omni: 39.1 (#115), Step 3.5 Flash: 42.6 (#84)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1430 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge Too close to call
MiMo-V2-Omni: 40.5 (#118), Step 3.5 Flash: 39.6 (#132)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1449 | 1421 |
Multimodal Not comparable
MiMo-V2-Omni: 38.6 (#63), Step 3.5 Flash: —
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1228 | — |
Multilingual MiMo-V2-Omni leads
MiMo-V2-Omni: 51.8 (#102), Step 3.5 Flash: 50.5 (#119)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1404 | 1385 |
| LMArena Chinese | 1465 | 1447 |
| LMArena French | 1447 | 1421 |
| LMArena German | 1399 | 1405 |
| LMArena Japanese | 1317 | 1354 |
| LMArena Korean | 1355 | 1352 |
| LMArena Russian | 1412 | 1385 |
| LMArena Spanish | 1434 | 1419 |
Instruction Following MiMo-V2-Omni leads
MiMo-V2-Omni: 75.2 (#66), Step 3.5 Flash: 73.1 (#124)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1428 | 1385 |
Long Context MiMo-V2-Omni leads
MiMo-V2-Omni: 44.1 (#76), Step 3.5 Flash: 42.8 (#117)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1442 | 1402 |
Writing & Preference MiMo-V2-Omni leads
MiMo-V2-Omni: 61.4 (#87), Step 3.5 Flash: 58.8 (#113)
| Benchmark | MiMo-V2-Omni | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1423 | 1403 |
| LMArena Creative Writing | 1392 | 1357 |
| LMArena Multi-Turn | 1445 | 1405 |
Frequently asked questions
Is MiMo-V2-Omni better than Step 3.5 Flash?
MiMo-V2-Omni is the stronger model overall, scoring 43.6 to 42.3 on the Noometry Index.
Which is cheaper, MiMo-V2-Omni 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-Omni lists at $0.14 and $0.28.
Is MiMo-V2-Omni or Step 3.5 Flash better for coding?
They score almost the same on coding (43.3 vs 42.4); test both on your own repository before choosing.
Which has the bigger context window?
MiMo-V2-Omni does, with 262K tokens against 256K.
How many benchmarks do MiMo-V2-Omni and Step 3.5 Flash share?
17 benchmarks have published results for both models. MiMo-V2-Omni has 18 scored results on Noometry and Step 3.5 Flash has 19.