Model comparison
Grok 4.1 Fast vs MiMo-V2.5-Pro
MiMo-V2.5-Pro is the stronger model overall, scoring 45.2 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 2.0× less per token, which makes it the better buy when MiMo-V2.5-Pro's lead doesn't matter for your workload.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and MiMo-V2.5-Pro in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 26.8.
- The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 34.4% for MiMo-V2.5-Pro.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.43 / $0.87 for MiMo-V2.5-Pro.
- MiMo-V2.5-Pro accepts more context: 1.05M tokens versus 128K.
- MiMo-V2.5-Pro has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 Fast | MiMo-V2.5-Pro | |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 41.4 | 45.2 |
| Released | 2025-06-27 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | 128K | 1.05M |
| Max output | 30K | 131K |
| Input $ / M tokens | $0.20 | $0.43 |
| Output $ / M tokens | $0.50 | $0.87 |
| Results tracked | 32 | 27 |
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Category by category
Coding MiMo-V2.5-Pro leads
Grok 4.1 Fast: 34.1 (#245), MiMo-V2.5-Pro: 47.4 (#60)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena WebDev | 1242 | 1479 |
| LMArena Coding | 1411 | 1503 |
| ALE-Bench | 394.93 | 899.8 |
| SciCode | — | 50.2% |
Agentic & Tool Use Not comparable
Grok 4.1 Fast: 36.3 (#39), MiMo-V2.5-Pro: —
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| 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-V2.5-Pro: 26.8 (#130)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| NYT Connections (extended) | 87.4% | 34.4% |
| LMArena Hard Prompts | 1407 | 1488 |
| DTBench | 87.7% | 84.5% |
| SimpleBench | 56% | — |
| CritPt | — | 4% |
| LMCA | — | 29.5% |
| ForecastBench | 61 | — |
Math MiMo-V2.5-Pro leads
Grok 4.1 Fast: 31.9 (#221), MiMo-V2.5-Pro: 40.0 (#96)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| ProofBench | 4% | 22% |
| LMArena Math | 1408 | 1481 |
| MathArena Final-Answer Competitions | 60.9% | — |
Knowledge MiMo-V2.5-Pro leads
Grok 4.1 Fast: 33.1 (#207), MiMo-V2.5-Pro: 42.2 (#98)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Expert | 1399 | 1503 |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal Not comparable
Grok 4.1 Fast: 37.0 (#76), MiMo-V2.5-Pro: —
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Vision | 1201 | — |
Multilingual MiMo-V2.5-Pro leads
Grok 4.1 Fast: 51.0 (#114), MiMo-V2.5-Pro: 55.1 (#34)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Non-English | 1391 | 1449 |
| LMArena Chinese | 1441 | 1507 |
| LMArena French | 1415 | 1488 |
| LMArena German | 1404 | 1458 |
| LMArena Japanese | 1349 | 1412 |
| LMArena Korean | 1361 | 1437 |
| LMArena Russian | 1387 | 1450 |
| LMArena Spanish | 1413 | 1471 |
Instruction Following MiMo-V2.5-Pro leads
Grok 4.1 Fast: 72.7 (#133), MiMo-V2.5-Pro: 77.5 (#21)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Instruction Following | 1376 | 1477 |
Long Context MiMo-V2.5-Pro leads
Grok 4.1 Fast: 42.4 (#126), MiMo-V2.5-Pro: 45.4 (#37)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Longer Query | 1390 | 1483 |
Writing & Preference MiMo-V2.5-Pro leads
Grok 4.1 Fast: 57.2 (#131), MiMo-V2.5-Pro: 65.3 (#49)
| Benchmark | Grok 4.1 Fast | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Text | 1408 | 1465 |
| LMArena Creative Writing | 1394 | 1440 |
| EQ-Bench Creative Writing | 1327 | 1493 |
| LMArena Multi-Turn | 1389 | 1477 |
| EQ-Bench 4 | — | 1208 |
Frequently asked questions
Is Grok 4.1 Fast better than MiMo-V2.5-Pro?
MiMo-V2.5-Pro is the stronger model overall, scoring 45.2 to 41.4 on the Noometry Index. Grok 4.1 Fast costs 2.0× less per token, which makes it the better buy when MiMo-V2.5-Pro's lead doesn't matter for your workload.
Which is cheaper, Grok 4.1 Fast or MiMo-V2.5-Pro?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; MiMo-V2.5-Pro lists at $0.43 and $0.87.
Is Grok 4.1 Fast or MiMo-V2.5-Pro better for coding?
MiMo-V2.5-Pro scores higher on coding benchmarks: 47.4 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.5-Pro does, with 1.05M tokens against 128K.
How many benchmarks do Grok 4.1 Fast and MiMo-V2.5-Pro share?
23 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and MiMo-V2.5-Pro has 27.