Model comparison
Grok 4 Fast vs MiMo-V2.6-Pro
MiMo-V2.6-Pro is the stronger model overall, scoring 46.7 to 39.0 on the Noometry Index.
Last verified . 13 shared benchmarks.
Summary
- They share 13 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and MiMo-V2.6-Pro in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where MiMo-V2.6-Pro leads 53.2 to 32.3.
- MiMo-V2.6-Pro has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | MiMo-V2.6-Pro | |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 39.0 | 46.7 |
| Released | 2025-09-19 | 2026-09-22 |
| Weights | Proprietary | Open |
| Context window | — | 1.05M |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.43 |
| Output $ / M tokens | — | $0.87 |
| Results tracked | 30 | 14 |
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Category by category
Coding MiMo-V2.6-Pro leads
Grok 4 Fast: 32.3 (#264), MiMo-V2.6-Pro: 53.2 (#27)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena WebDev | 1160 | 1618 |
| LMArena Coding | 1429 | 1538 |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), MiMo-V2.6-Pro: —
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning MiMo-V2.6-Pro leads
Grok 4 Fast: 22.5 (#179), MiMo-V2.6-Pro: 30.4 (#76)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1511 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |
Math MiMo-V2.6-Pro leads
Grok 4 Fast: 36.1 (#126), MiMo-V2.6-Pro: 37.9 (#91)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Math | 1419 | 1497 |
Knowledge MiMo-V2.6-Pro leads
Grok 4 Fast: 31.5 (#211), MiMo-V2.6-Pro: 43.0 (#85)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Expert | 1411 | 1548 |
| Vectara Hallucination Rate | 19.7% | — |
Multimodal Not comparable
Grok 4 Fast: —, MiMo-V2.6-Pro: 40.2 (#40)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Vision | — | 1265 |
Multilingual MiMo-V2.6-Pro leads
Grok 4 Fast: 51.5 (#106), MiMo-V2.6-Pro: 57.0 (#15)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Non-English | 1397 | 1474 |
| LMArena Chinese | 1458 | 1532 |
| LMArena Russian | 1387 | 1481 |
| LMArena French | 1433 | — |
| LMArena German | 1383 | — |
| LMArena Japanese | 1358 | — |
| LMArena Korean | 1359 | — |
| LMArena Spanish | 1414 | — |
Instruction Following MiMo-V2.6-Pro leads
Grok 4 Fast: 73.4 (#116), MiMo-V2.6-Pro: 78.2 (#10)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Instruction Following | 1388 | 1490 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), MiMo-V2.6-Pro: 46.0 (#26)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Longer Query | 1415 | 1500 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference MiMo-V2.6-Pro leads
Grok 4 Fast: 60.2 (#96), MiMo-V2.6-Pro: 66.9 (#32)
| Benchmark | Grok 4 Fast | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Text | 1407 | 1491 |
| LMArena Creative Writing | 1388 | 1465 |
| LMArena Multi-Turn | 1414 | 1463 |
Frequently asked questions
Is Grok 4 Fast better than MiMo-V2.6-Pro?
MiMo-V2.6-Pro is the stronger model overall, scoring 46.7 to 39.0 on the Noometry Index.
Is Grok 4 Fast or MiMo-V2.6-Pro better for coding?
MiMo-V2.6-Pro scores higher on coding benchmarks: 53.2 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and MiMo-V2.6-Pro share?
13 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and MiMo-V2.6-Pro has 14.