Model comparison
Grok 4.1 Fast vs MiMo-V2-Flash
Grok 4.1 Fast and MiMo-V2-Flash score almost the same on the Noometry Index (41.4 vs 41.3), so choose on price, context window or the category you care about most.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and MiMo-V2-Flash in 7 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 24.9.
- MiMo-V2-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $0.20 / $0.50 for Grok 4.1 Fast.
- MiMo-V2-Flash accepts more context: 262K tokens versus 128K.
- MiMo-V2-Flash has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 Fast | MiMo-V2-Flash | |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 41.4 | 41.3 |
| Released | 2025-06-27 | 2025-12-16 |
| Weights | Proprietary | Open |
| Context window | 128K | 262K |
| Max output | 30K | 66K |
| Input $ / M tokens | $0.20 | $0.14 |
| Output $ / M tokens | $0.50 | $0.28 |
| Results tracked | 32 | 21 |
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Category by category
Coding MiMo-V2-Flash leads
Grok 4.1 Fast: 34.1 (#245), MiMo-V2-Flash: 36.1 (#211)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena WebDev | 1242 | 1330 |
| LMArena Coding | 1411 | 1443 |
| ALE-Bench | 394.93 | 737.95 |
| SciCode | — | 25.9% |
Agentic & Tool Use Not comparable
Grok 4.1 Fast: 36.3 (#39), MiMo-V2-Flash: —
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Grok 4.1 Fast leads
Grok 4.1 Fast: 43.4 (#49), MiMo-V2-Flash: 24.9 (#157)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1420 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| CritPt | — | 0% |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |
Math MiMo-V2-Flash leads
Grok 4.1 Fast: 31.9 (#221), MiMo-V2-Flash: 38.3 (#139)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Math | 1408 | 1396 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
Knowledge MiMo-V2-Flash leads
Grok 4.1 Fast: 33.1 (#207), MiMo-V2-Flash: 39.7 (#131)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Expert | 1399 | 1425 |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal Not comparable
Grok 4.1 Fast: 37.0 (#76), MiMo-V2-Flash: —
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Vision | 1201 | — |
Multilingual Too close to call
Grok 4.1 Fast: 51.0 (#114), MiMo-V2-Flash: 51.0 (#113)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Non-English | 1391 | 1392 |
| LMArena Chinese | 1441 | 1462 |
| LMArena French | 1415 | 1429 |
| LMArena German | 1404 | 1395 |
| LMArena Japanese | 1349 | 1325 |
| LMArena Korean | 1361 | 1358 |
| LMArena Russian | 1387 | 1387 |
| LMArena Spanish | 1413 | 1420 |
Instruction Following Too close to call
Grok 4.1 Fast: 72.7 (#133), MiMo-V2-Flash: 73.5 (#120)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Instruction Following | 1376 | 1392 |
Long Context Too close to call
Grok 4.1 Fast: 42.4 (#126), MiMo-V2-Flash: 43.0 (#110)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Longer Query | 1390 | 1409 |
Writing & Preference MiMo-V2-Flash leads
Grok 4.1 Fast: 57.2 (#131), MiMo-V2-Flash: 59.7 (#106)
| Benchmark | Grok 4.1 Fast | MiMo-V2-Flash |
|---|---|---|
| LMArena Text | 1408 | 1411 |
| LMArena Creative Writing | 1394 | 1375 |
| LMArena Multi-Turn | 1389 | 1404 |
| EQ-Bench Creative Writing | 1327 | — |
Frequently asked questions
Is Grok 4.1 Fast better than MiMo-V2-Flash?
Grok 4.1 Fast and MiMo-V2-Flash score almost the same on the Noometry Index (41.4 vs 41.3), so choose on price, context window or the category you care about most.
Which is cheaper, Grok 4.1 Fast or MiMo-V2-Flash?
MiMo-V2-Flash is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; Grok 4.1 Fast lists at $0.20 and $0.50.
Is Grok 4.1 Fast or MiMo-V2-Flash better for coding?
MiMo-V2-Flash scores higher on coding benchmarks: 36.1 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2-Flash does, with 262K tokens against 128K.
How many benchmarks do Grok 4.1 Fast and MiMo-V2-Flash share?
19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and MiMo-V2-Flash has 21.