Model comparison
MiMo-V2.5 vs Step 2 16k Exp 202412
MiMo-V2.5 is the stronger model overall, scoring 43.4 to 39.2 on the Noometry Index.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. MiMo-V2.5 scores higher in 8 categories and Step 2 16k Exp 202412 in 0 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where MiMo-V2.5 leads 61.6 to 52.3.
- MiMo-V2.5 has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2.5 | Step 2 16k Exp 202412 | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 43.4 | 39.2 |
| Released | 2026-04-22 | — |
| Weights | Open | Proprietary |
| Context window | 1.05M | — |
| Max output | 131K | — |
| Input $ / M tokens | $0.14 | — |
| Output $ / M tokens | $0.28 | — |
| Results tracked | 23 | 12 |
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Category by category
Coding MiMo-V2.5 leads
MiMo-V2.5: 43.9 (#81), Step 2 16k Exp 202412: 38.5 (#174)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Coding | 1469 | 1316 |
| LMArena WebDev | 1438 | — |
| SciCode | 43.1% | — |
| ALE-Bench | 513.95 | — |
Reasoning MiMo-V2.5 leads
MiMo-V2.5: 28.6 (#101), Step 2 16k Exp 202412: 25.9 (#142)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Hard Prompts | 1450 | 1299 |
| CritPt | 3.7% | — |
Math Too close to call
MiMo-V2.5: 36.8 (#163), Step 2 16k Exp 202412: 36.3 (#169)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Math | 1436 | 1304 |
| ProofBench | 16% | — |
Knowledge MiMo-V2.5 leads
MiMo-V2.5: 40.8 (#115), Step 2 16k Exp 202412: 35.2 (#187)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Expert | 1460 | 1279 |
Multimodal Not comparable
MiMo-V2.5: 39.8 (#54), Step 2 16k Exp 202412: —
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Vision | 1247 | — |
Multilingual MiMo-V2.5 leads
MiMo-V2.5: 51.9 (#99), Step 2 16k Exp 202412: 43.7 (#181)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Non-English | 1404 | 1290 |
| LMArena Chinese | 1468 | 1331 |
| LMArena Russian | 1395 | 1324 |
| LMArena French | 1447 | — |
| LMArena German | 1421 | — |
| LMArena Japanese | 1306 | — |
| LMArena Korean | 1363 | — |
| LMArena Spanish | 1416 | — |
Instruction Following MiMo-V2.5 leads
MiMo-V2.5: 75.5 (#60), Step 2 16k Exp 202412: 67.9 (#192)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Instruction Following | 1434 | 1287 |
Long Context MiMo-V2.5 leads
MiMo-V2.5: 44.2 (#73), Step 2 16k Exp 202412: 39.7 (#170)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Longer Query | 1445 | 1307 |
Writing & Preference MiMo-V2.5 leads
MiMo-V2.5: 61.6 (#86), Step 2 16k Exp 202412: 52.3 (#173)
| Benchmark | MiMo-V2.5 | Step 2 16k Exp 202412 |
|---|---|---|
| LMArena Text | 1428 | 1321 |
| LMArena Creative Writing | 1393 | 1328 |
| LMArena Multi-Turn | 1445 | 1292 |
Frequently asked questions
Is MiMo-V2.5 better than Step 2 16k Exp 202412?
MiMo-V2.5 is the stronger model overall, scoring 43.4 to 39.2 on the Noometry Index.
Is MiMo-V2.5 or Step 2 16k Exp 202412 better for coding?
MiMo-V2.5 scores higher on coding benchmarks: 43.9 versus 38.5 in the Noometry coding category.
How many benchmarks do MiMo-V2.5 and Step 2 16k Exp 202412 share?
12 benchmarks have published results for both models. MiMo-V2.5 has 23 scored results on Noometry and Step 2 16k Exp 202412 has 12.