Model comparison
Grok 4.1 Fast vs MiMo-V2.6-Flash
MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 41.4 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and MiMo-V2.6-Flash in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where MiMo-V2.6-Flash leads 51.9 to 31.9.
- The biggest single-benchmark swing is ProofBench: 4% for Grok 4.1 Fast and 63% for MiMo-V2.6-Flash.
- MiMo-V2.6-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $0.20 / $0.50 for Grok 4.1 Fast.
- MiMo-V2.6-Flash accepts more context: 1.05M tokens versus 128K.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 Fast | MiMo-V2.6-Flash | |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 41.4 | 48.5 |
| Released | 2025-06-27 | 2026-09-21 |
| Weights | Proprietary | Open |
| Context window | 128K | 1.05M |
| Max output | 30K | 131K |
| Input $ / M tokens | $0.20 | $0.14 |
| Output $ / M tokens | $0.50 | $0.28 |
| Results tracked | 32 | 19 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding MiMo-V2.6-Flash leads
Grok 4.1 Fast: 34.1 (#245), MiMo-V2.6-Flash: 53.4 (#30)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena WebDev | 1242 | 1637 |
| LMArena Coding | 1411 | 1504 |
| SciCode | — | 51.3% |
| ALE-Bench | 394.93 | — |
Agentic & Tool Use Not comparable
Grok 4.1 Fast: 36.3 (#39), MiMo-V2.6-Flash: —
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-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-V2.6-Flash: 36.5 (#66)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1482 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| CritPt | — | 12% |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |
Math MiMo-V2.6-Flash leads
Grok 4.1 Fast: 31.9 (#221), MiMo-V2.6-Flash: 51.9 (#52)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| ProofBench | 4% | 63% |
| LMArena Math | 1408 | 1468 |
| MathArena Final-Answer Competitions | 60.9% | — |
Knowledge MiMo-V2.6-Flash leads
Grok 4.1 Fast: 33.1 (#207), MiMo-V2.6-Flash: 42.2 (#99)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Expert | 1399 | 1501 |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal MiMo-V2.6-Flash leads
Grok 4.1 Fast: 37.0 (#76), MiMo-V2.6-Flash: 40.5 (#47)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Vision | 1201 | 1259 |
Multilingual MiMo-V2.6-Flash leads
Grok 4.1 Fast: 51.0 (#114), MiMo-V2.6-Flash: 54.0 (#51)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Non-English | 1391 | 1434 |
| LMArena Chinese | 1441 | 1511 |
| LMArena French | 1415 | 1475 |
| LMArena Russian | 1387 | 1409 |
| LMArena Spanish | 1413 | 1456 |
| LMArena German | 1404 | — |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1361 | — |
Instruction Following MiMo-V2.6-Flash leads
Grok 4.1 Fast: 72.7 (#133), MiMo-V2.6-Flash: 76.8 (#35)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Instruction Following | 1376 | 1463 |
Long Context MiMo-V2.6-Flash leads
Grok 4.1 Fast: 42.4 (#126), MiMo-V2.6-Flash: 44.8 (#57)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Longer Query | 1390 | 1463 |
Writing & Preference MiMo-V2.6-Flash leads
Grok 4.1 Fast: 57.2 (#131), MiMo-V2.6-Flash: 63.1 (#67)
| Benchmark | Grok 4.1 Fast | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Text | 1408 | 1455 |
| LMArena Creative Writing | 1394 | 1400 |
| LMArena Multi-Turn | 1389 | 1451 |
| EQ-Bench Creative Writing | 1327 | — |
Frequently asked questions
Is Grok 4.1 Fast better than MiMo-V2.6-Flash?
MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 41.4 on the Noometry Index.
Which is cheaper, Grok 4.1 Fast or MiMo-V2.6-Flash?
MiMo-V2.6-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-V2.6-Flash better for coding?
MiMo-V2.6-Flash scores higher on coding benchmarks: 53.4 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.6-Flash does, with 1.05M tokens against 128K.
How many benchmarks do Grok 4.1 Fast and MiMo-V2.6-Flash share?
17 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and MiMo-V2.6-Flash has 19.