# Grok 4 Fast vs MiniMax-M2.5

> Grok 4 Fast and MiniMax-M2.5 score almost the same on the Noometry Index (39.0 vs 38.1), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-minimax-m2-5
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. Grok 4 Fast scores higher in 6 categories and MiniMax-M2.5 in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 37.4.
- The biggest single-benchmark swing is ARC-AGI-1: 48.5% for Grok 4 Fast and 63.7% for MiniMax-M2.5.
- MiniMax-M2.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| Provider | xAI | MiniMax |
| Noometry Index | 39.0 | 38.1 |
| Rank | 164 | 181 |
| Context | — | 205K |
| Input $/M | — | $0.30 |
| Output $/M | — | $1.20 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.3 (#264)
- MiniMax-M2.5: 47.9 (#53)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| LMArena WebDev | 1160 | 1386 |
| LMArena Coding | 1429 | 1380 |
| SWE-bench Verified (bash only) | — | 75.8% |
| SWE-bench Multilingual | — | 68.3% |
| WeirdML | 42.9% | — |
| ALE-Bench | — | 618.17 |

## Agentic & Tool Use

- Grok 4 Fast: 29.3 (#80)
- MiniMax-M2.5: 30.2 (#70)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| Terminal-Bench | — | 42.7% |
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | — | -23.16 |

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- MiniMax-M2.5: 17.6 (#281)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| ARC-AGI-2 | 5.3% | 4.9% |
| Kagi LLM Benchmark | 66.1% | 55.2% |
| ARC-AGI-1 | 48.5% | 63.7% |
| LMArena Hard Prompts | 1413 | 1372 |
| Epoch Capabilities Index | 144.21 | 146.68 |
| NYT Connections (extended) | — | 16.8% |
| DTBench | 82.7% | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- MiniMax-M2.5: 25.8 (#242)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| LMArena Math | 1419 | 1378 |
| ProofBench | — | 4% |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- MiniMax-M2.5: 38.6 (#132)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| Vectara Hallucination Rate | 19.7% | 9.1% |
| LMArena Expert | 1411 | 1378 |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- MiniMax-M2.5: 47.3 (#147)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| LMArena Non-English | 1397 | 1338 |
| LMArena Chinese | 1458 | 1392 |
| LMArena French | 1433 | 1363 |
| LMArena German | 1383 | 1361 |
| LMArena Japanese | 1358 | 1169 |
| LMArena Korean | 1359 | 1232 |
| LMArena Russian | 1387 | 1359 |
| LMArena Spanish | 1414 | 1354 |

## Instruction Following

- Grok 4 Fast: 73.4 (#116)
- MiniMax-M2.5: 71.7 (#143)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| LMArena Instruction Following | 1388 | 1353 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- MiniMax-M2.5: 37.4 (#211)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| LMArena Longer Query | 1415 | 1367 |
| Fiction.LiveBench | 94.4% | — |
| CL-bench | — | 11.4% |
| CL-bench Life | — | 6.3% |

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- MiniMax-M2.5: 54.1 (#149)

| Benchmark | Grok 4 Fast | MiniMax-M2.5 |
|---|---|---|
| LMArena Text | 1407 | 1359 |
| LMArena Creative Writing | 1388 | 1331 |
| LMArena Multi-Turn | 1414 | 1364 |
| EQ-Bench Creative Writing | — | 1361 |

## FAQ

### Is Grok 4 Fast better than MiniMax-M2.5?

Grok 4 Fast and MiniMax-M2.5 score almost the same on the Noometry Index (39.0 vs 38.1), so choose on price, context window or the category you care about most.

### Is Grok 4 Fast or MiniMax-M2.5 better for coding?

MiniMax-M2.5 scores higher on coding benchmarks: 47.9 versus 32.3 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and MiniMax-M2.5 share?

23 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and MiniMax-M2.5 has 33.