Model comparison
MiMo-V2.6-Pro vs Step 5 Preview
MiMo-V2.6-Pro is the stronger model overall, scoring 50.3 to 47.9 on the Noometry Index.
Last verified . 17 shared benchmarks.
StepFunSummary
- They share 17 benchmarks with published results for both. MiMo-V2.6-Pro scores higher in 8 categories and Step 5 Preview in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where MiMo-V2.6-Pro leads 54.5 to 46.1.
- The biggest single-benchmark swing is ProofBench: 70% for MiMo-V2.6-Pro and 42% for Step 5 Preview.
- MiMo-V2.6-Pro is cheaper at $0.43 / $0.87 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- MiMo-V2.6-Pro accepts more context: 1.05M tokens versus 1.02M.
- MiMo-V2.6-Pro has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2.6-Pro | Step 5 Preview | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 50.3 | 47.9 |
| Released | 2026-09-21 | 2026-09-16 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 1.02M |
| Max output | 131K | 66K |
| Input $ / M tokens | $0.43 | $1 |
| Output $ / M tokens | $0.87 | $2.70 |
| Results tracked | 19 | 18 |
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Category by category
Coding MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 55.5 (#23), Step 5 Preview: 51.8 (#36)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1629 | 1564 |
| SciCode | 60.9% | 58.9% |
| LMArena Coding | 1534 | 1480 |
| ALE-Bench | 1,158 | — |
Agentic & Tool Use Not comparable
MiMo-V2.6-Pro: 37.5 (#35), Step 5 Preview: —
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| APEX-Agents | 59.5% | — |
Reasoning MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 43.1 (#50), Step 5 Preview: 40.0 (#57)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| CritPt | 26.6% | 20.9% |
| LMArena Hard Prompts | 1512 | 1465 |
Math MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 54.5 (#45), Step 5 Preview: 46.1 (#72)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| ProofBench | 70% | 42% |
| LMArena Math | 1494 | 1470 |
Knowledge MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 43.5 (#92), Step 5 Preview: 41.2 (#112)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1543 | 1470 |
Multimodal Too close to call
MiMo-V2.6-Pro: 40.8 (#43), Step 5 Preview: 41.0 (#41)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1264 | 1267 |
Multilingual MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 56.9 (#14), Step 5 Preview: 53.8 (#54)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1474 | 1432 |
| LMArena Chinese | 1529 | 1519 |
| LMArena Russian | 1480 | 1436 |
| LMArena Spanish | — | 1439 |
Instruction Following MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 78.2 (#12), Step 5 Preview: 76.0 (#50)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1493 | 1444 |
Long Context MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 46.0 (#27), Step 5 Preview: 44.5 (#64)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1501 | 1455 |
Writing & Preference MiMo-V2.6-Pro leads
MiMo-V2.6-Pro: 66.8 (#33), Step 5 Preview: 62.8 (#71)
| Benchmark | MiMo-V2.6-Pro | Step 5 Preview |
|---|---|---|
| LMArena Text | 1492 | 1442 |
| LMArena Creative Writing | 1468 | 1410 |
| LMArena Multi-Turn | 1464 | 1447 |
Frequently asked questions
Is MiMo-V2.6-Pro better than Step 5 Preview?
MiMo-V2.6-Pro is the stronger model overall, scoring 50.3 to 47.9 on the Noometry Index.
Which is cheaper, MiMo-V2.6-Pro or Step 5 Preview?
MiMo-V2.6-Pro is cheaper. It lists at $0.43 per million input tokens and $0.87 per million output tokens; Step 5 Preview lists at $1 and $2.70.
Is MiMo-V2.6-Pro or Step 5 Preview better for coding?
MiMo-V2.6-Pro scores higher on coding benchmarks: 55.5 versus 51.8 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.6-Pro does, with 1.05M tokens against 1.02M.
How many benchmarks do MiMo-V2.6-Pro and Step 5 Preview share?
17 benchmarks have published results for both models. MiMo-V2.6-Pro has 19 scored results on Noometry and Step 5 Preview has 18.