Model comparison
Grok 4.3 vs MiMo-V2.5
Grok 4.3 and MiMo-V2.5 score almost the same on the Noometry Index (43.8 vs 43.4), so choose on price, context window or the category you care about most.
Last verified . 23 shared benchmarks.
Summary
- They share 23 benchmarks with published results for both. Grok 4.3 scores higher in 3 categories and MiMo-V2.5 in 6 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.3 leads 52.5 to 40.8.
- The biggest single-benchmark swing is ProofBench: 11% for Grok 4.3 and 16% for MiMo-V2.5.
- MiMo-V2.5 is cheaper at $0.14 / $0.28 per million input/output tokens, against $1.25 / $2.50 for Grok 4.3.
- MiMo-V2.5 accepts more context: 1.05M tokens versus 1M.
- MiMo-V2.5 has downloadable open weights; the other is API-only.
Side by side
| Grok 4.3 | MiMo-V2.5 | |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 43.8 | 43.4 |
| Released | 2026-04-17 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | 1M | 1.05M |
| Max output | 30K | 131K |
| Input $ / M tokens | $1.25 | $0.14 |
| Output $ / M tokens | $2.50 | $0.28 |
| Results tracked | 40 | 23 |
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Category by category
Coding MiMo-V2.5 leads
Grok 4.3: 41.6 (#121), MiMo-V2.5: 43.9 (#81)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena WebDev | 1357 | 1438 |
| SciCode | 47.3% | 43.1% |
| LMArena Coding | 1415 | 1469 |
| ALE-Bench | 944.17 | 513.95 |
| WeirdML | 49.9% | — |
Agentic & Tool Use Not comparable
Grok 4.3: 27.7 (#99), MiMo-V2.5: —
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Grok 4.3 leads
Grok 4.3: 35.9 (#68), MiMo-V2.5: 28.6 (#101)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| CritPt | 8% | 3.7% |
| LMArena Hard Prompts | 1396 | 1450 |
| NYT Connections (extended) | 55.2% | — |
| Chess Puzzles | 25% | — |
| DTBench | 90.7% | — |
| LMCA | 38.3% | — |
| Epoch Capabilities Index | 149.16 | — |
| ForecastBench | 60.3 | — |
Math Grok 4.3 leads
Grok 4.3: 46.0 (#74), MiMo-V2.5: 36.8 (#163)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| ProofBench | 11% | 16% |
| LMArena Math | 1388 | 1436 |
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
Knowledge Grok 4.3 leads
Grok 4.3: 52.5 (#62), MiMo-V2.5: 40.8 (#115)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | 1385 | 1460 |
| GPQA Diamond | 88.8% | — |
| SimpleQA Verified | 33.2% | — |
Multimodal MiMo-V2.5 leads
Grok 4.3: 31.6 (#104), MiMo-V2.5: 39.8 (#54)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | 1229 | 1247 |
| Blueprint-Bench 2 | 0% | — |
Multilingual MiMo-V2.5 leads
Grok 4.3: 50.5 (#120), MiMo-V2.5: 51.9 (#99)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | 1385 | 1404 |
| LMArena Chinese | 1422 | 1468 |
| LMArena French | 1412 | 1447 |
| LMArena German | 1395 | 1421 |
| LMArena Japanese | 1379 | 1306 |
| LMArena Korean | 1356 | 1363 |
| LMArena Russian | 1399 | 1395 |
| LMArena Spanish | 1398 | 1416 |
Instruction Following MiMo-V2.5 leads
Grok 4.3: 72.1 (#140), MiMo-V2.5: 75.5 (#60)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1434 |
Long Context MiMo-V2.5 leads
Grok 4.3: 42.5 (#123), MiMo-V2.5: 44.2 (#73)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | 1393 | 1445 |
Writing & Preference MiMo-V2.5 leads
Grok 4.3: 58.5 (#118), MiMo-V2.5: 61.6 (#86)
| Benchmark | Grok 4.3 | MiMo-V2.5 |
|---|---|---|
| LMArena Text | 1397 | 1428 |
| LMArena Creative Writing | 1380 | 1393 |
| LMArena Multi-Turn | 1406 | 1445 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than MiMo-V2.5?
Grok 4.3 and MiMo-V2.5 score almost the same on the Noometry Index (43.8 vs 43.4), so choose on price, context window or the category you care about most.
Which is cheaper, Grok 4.3 or MiMo-V2.5?
MiMo-V2.5 is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; Grok 4.3 lists at $1.25 and $2.50.
Is Grok 4.3 or MiMo-V2.5 better for coding?
MiMo-V2.5 scores higher on coding benchmarks: 43.9 versus 41.6 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.5 does, with 1.05M tokens against 1M.
How many benchmarks do Grok 4.3 and MiMo-V2.5 share?
23 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and MiMo-V2.5 has 23.