Model comparison
Grok 4 Fast vs Qwen2.5 Plus 1127
Grok 4 Fast and Qwen2.5 Plus 1127 score almost the same on the Noometry Index (39.4 vs 38.8), so choose on price, context window or the category you care about most.
Last verified . 14 shared benchmarks.
Alibaba (Qwen)Summary
- They share 14 benchmarks with published results for both. Grok 4 Fast scores higher in 5 categories and Qwen2.5 Plus 1127 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 39.2.
Side by side
| Grok 4 Fast | Qwen2.5 Plus 1127 | |
|---|---|---|
| Provider | xAI | Alibaba (Qwen) |
| Noometry Index | 39.4 | 38.8 |
| Released | 2025-09-19 | — |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 14 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Qwen2.5 Plus 1127 leads
Grok 4 Fast: 32.5 (#271), Qwen2.5 Plus 1127: 38.5 (#175)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Coding | 1429 | 1314 |
| LMArena WebDev | 1159 | — |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.5 (#86), Qwen2.5 Plus 1127: —
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Qwen2.5 Plus 1127 leads
Grok 4 Fast: 22.2 (#201), Qwen2.5 Plus 1127: 25.9 (#141)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1299 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.2 | — |
| ForecastBench | 60.5 | — |
Math Grok 4 Fast leads
Grok 4 Fast: 38.9 (#123), Qwen2.5 Plus 1127: 36.1 (#174)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Math | 1419 | 1298 |
Knowledge Qwen2.5 Plus 1127 leads
Grok 4 Fast: 32.0 (#214), Qwen2.5 Plus 1127: 35.5 (#183)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Expert | 1411 | 1289 |
| Vectara Hallucination Rate | 19.7% | — |
Multilingual Grok 4 Fast leads
Grok 4 Fast: 51.3 (#111), Qwen2.5 Plus 1127: 41.9 (#201)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Non-English | 1396 | 1265 |
| LMArena Chinese | 1457 | 1314 |
| LMArena German | 1383 | 1231 |
| LMArena Japanese | 1352 | 1207 |
| LMArena Russian | 1389 | 1271 |
| LMArena French | 1431 | — |
| LMArena Korean | 1357 | — |
| LMArena Spanish | 1415 | — |
Instruction Following Grok 4 Fast leads
Grok 4 Fast: 73.2 (#121), Qwen2.5 Plus 1127: 67.2 (#199)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Instruction Following | 1387 | 1275 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Qwen2.5 Plus 1127: 39.2 (#184)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Longer Query | 1415 | 1292 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 Fast leads
Grok 4 Fast: 60.0 (#102), Qwen2.5 Plus 1127: 49.4 (#192)
| Benchmark | Grok 4 Fast | Qwen2.5 Plus 1127 |
|---|---|---|
| LMArena Text | 1407 | 1299 |
| LMArena Creative Writing | 1387 | 1262 |
| LMArena Multi-Turn | 1414 | 1299 |
Frequently asked questions
Is Grok 4 Fast better than Qwen2.5 Plus 1127?
Grok 4 Fast and Qwen2.5 Plus 1127 score almost the same on the Noometry Index (39.4 vs 38.8), so choose on price, context window or the category you care about most.
Is Grok 4 Fast or Qwen2.5 Plus 1127 better for coding?
Qwen2.5 Plus 1127 scores higher on coding benchmarks: 38.5 versus 32.5 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Qwen2.5 Plus 1127 share?
14 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Qwen2.5 Plus 1127 has 14.