Model comparison
Grok 4 Fast vs Qwen3.5 Max Preview
Qwen3.5 Max Preview is the stronger model overall, scoring 44.7 to 39.0 on the Noometry Index.
Last verified . 17 shared benchmarks.
Alibaba (Qwen)Summary
- They share 17 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Qwen3.5 Max Preview in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 45.2.
Side by side
| Grok 4 Fast | Qwen3.5 Max Preview | |
|---|---|---|
| Provider | xAI | Alibaba (Qwen) |
| Noometry Index | 39.0 | 44.7 |
| Released | 2025-09-19 | — |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 17 |
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Category by category
Coding Qwen3.5 Max Preview leads
Grok 4 Fast: 32.3 (#264), Qwen3.5 Max Preview: 43.4 (#79)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Coding | 1429 | 1488 |
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), Qwen3.5 Max Preview: —
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Qwen3.5 Max Preview leads
Grok 4 Fast: 22.5 (#179), Qwen3.5 Max Preview: 29.6 (#81)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1483 |
| 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 Qwen3.5 Max Preview leads
Grok 4 Fast: 36.1 (#126), Qwen3.5 Max Preview: 37.3 (#99)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Math | 1419 | 1473 |
Knowledge Qwen3.5 Max Preview leads
Grok 4 Fast: 31.5 (#211), Qwen3.5 Max Preview: 41.1 (#104)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Expert | 1411 | 1489 |
| Vectara Hallucination Rate | 19.7% | — |
Multilingual Qwen3.5 Max Preview leads
Grok 4 Fast: 51.5 (#106), Qwen3.5 Max Preview: 56.4 (#21)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Non-English | 1397 | 1465 |
| LMArena Chinese | 1458 | 1534 |
| LMArena French | 1433 | 1483 |
| LMArena German | 1383 | 1487 |
| LMArena Japanese | 1358 | 1497 |
| LMArena Korean | 1359 | 1438 |
| LMArena Russian | 1387 | 1472 |
| LMArena Spanish | 1414 | 1470 |
Instruction Following Qwen3.5 Max Preview leads
Grok 4 Fast: 73.4 (#116), Qwen3.5 Max Preview: 77.2 (#28)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Instruction Following | 1388 | 1467 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Qwen3.5 Max Preview: 45.2 (#44)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Longer Query | 1415 | 1477 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Qwen3.5 Max Preview leads
Grok 4 Fast: 60.2 (#96), Qwen3.5 Max Preview: 66.1 (#39)
| Benchmark | Grok 4 Fast | Qwen3.5 Max Preview |
|---|---|---|
| LMArena Text | 1407 | 1471 |
| LMArena Creative Writing | 1388 | 1464 |
| LMArena Multi-Turn | 1414 | 1478 |
Frequently asked questions
Is Grok 4 Fast better than Qwen3.5 Max Preview?
Qwen3.5 Max Preview is the stronger model overall, scoring 44.7 to 39.0 on the Noometry Index.
Is Grok 4 Fast or Qwen3.5 Max Preview better for coding?
Qwen3.5 Max Preview scores higher on coding benchmarks: 43.4 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Qwen3.5 Max Preview share?
17 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Qwen3.5 Max Preview has 17.