Model comparison
Grok 4 Fast vs Qwen3.5-9B
Grok 4 Fast is the stronger model overall, scoring 39.4 to 33.8 on the Noometry Index.
Last verified . 2 shared benchmarks.
Alibaba (Qwen)Summary
- They share 2 benchmarks with published results for both. Grok 4 Fast scores higher in 2 categories and Qwen3.5-9B in 3 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Grok 4 Fast leads 29.5 to 14.5.
- The biggest single-benchmark swing is DTBench: 82.7% for Grok 4 Fast and 71.2% for Qwen3.5-9B.
- Qwen3.5-9B has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Qwen3.5-9B | |
|---|---|---|
| Provider | xAI | Alibaba (Qwen) |
| Noometry Index | 39.4 | 33.8 |
| Released | 2025-09-19 | 2026-02-23 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 66K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.15 |
| Results tracked | 30 | 10 |
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Category by category
Coding Qwen3.5-9B leads
Grok 4 Fast: 32.5 (#271), Qwen3.5-9B: 35.9 (#217)
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| LMArena WebDev | 1159 | — |
| SciCode | — | 27.5% |
| WeirdML | 42.9% | — |
| LMArena Coding | 1429 | — |
Agentic & Tool Use Grok 4 Fast leads
Grok 4 Fast: 29.5 (#86), Qwen3.5-9B: 14.5 (#151)
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| Terminal-Bench | — | 9.2% |
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Too close to call
Grok 4 Fast: 22.2 (#201), Qwen3.5-9B: 23.1 (#182)
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| DTBench | 82.7% | 71.2% |
| Epoch Capabilities Index | 144.2 | 139.46 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 12% |
| LMArena Hard Prompts | 1412 | — |
| LMCA | — | 24.5% |
| ForecastBench | 60.5 | — |
Math Grok 4 Fast leads
Grok 4 Fast: 38.9 (#123), Qwen3.5-9B: 34.8 (#192)
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| MathArena Final-Answer Competitions | — | 48.5% |
| OTIS Mock AIME 2024-2025 | — | 61.7% |
| LMArena Math | 1419 | — |
Knowledge Qwen3.5-9B leads
Grok 4 Fast: 32.0 (#214), Qwen3.5-9B: 46.0 (#84)
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| GPQA Diamond | — | 79% |
| Vectara Hallucination Rate | 19.7% | — |
| LMArena Expert | 1411 | — |
Multilingual Not comparable
Grok 4 Fast: 51.3 (#111), Qwen3.5-9B: —
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| LMArena Non-English | 1396 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1431 | — |
| LMArena German | 1383 | — |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1357 | — |
| LMArena Russian | 1389 | — |
| LMArena Spanish | 1415 | — |
Instruction Following Not comparable
Grok 4 Fast: 73.2 (#121), Qwen3.5-9B: —
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| LMArena Instruction Following | 1387 | — |
Long Context Not comparable
Grok 4 Fast: 63.2 (#3), Qwen3.5-9B: —
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| Fiction.LiveBench | 94.4% | — |
| LMArena Longer Query | 1415 | — |
Writing & Preference Not comparable
Grok 4 Fast: 60.0 (#102), Qwen3.5-9B: —
| Benchmark | Grok 4 Fast | Qwen3.5-9B |
|---|---|---|
| LMArena Text | 1407 | — |
| LMArena Creative Writing | 1387 | — |
| LMArena Multi-Turn | 1414 | — |
Frequently asked questions
Is Grok 4 Fast better than Qwen3.5-9B?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 33.8 on the Noometry Index.
Is Grok 4 Fast or Qwen3.5-9B better for coding?
Qwen3.5-9B scores higher on coding benchmarks: 35.9 versus 32.5 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Qwen3.5-9B share?
2 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Qwen3.5-9B has 10.