Grok 4 Fast Reasoning vs Qwen3.5 9B
| Spec | Grok 4 Fast Reasoning | Qwen3.5 9B |
|---|---|---|
| Respan Index | 20.4 (#116) | 20.5 (#115) |
| Blended price per 1M | - | $0.1 |
| Context window | 2M | 262K |
| Input / output per 1M | - | $0.09 / $0.13 |
| Max output | - | - |
| Input | text | text, vision, video |
| Released | 2025-09-19 | 2026-03-02 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Grok 4 Fast Reasoning | Qwen3.5 9B |
|---|---|---|
| Coding | 5.0* Grok 4 Fast Reasoning | 2.8 Qwen3.5 9B |
| Agents | 18.7 Grok 4 Fast Reasoning | 23.0 Qwen3.5 9B |
| Reasoning | 25.5 Grok 4 Fast Reasoning | 23.4 Qwen3.5 9B |
| Knowledge & language | 14.5* Grok 4 Fast Reasoning | 14.6 Qwen3.5 9B |
| Human preference | 44.2 Grok 4 Fast Reasoning | 44.6* Qwen3.5 9B |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Grok 4 Fast Reasoning leads on 1 of the 1 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | Grok 4 Fast Reasoning | Qwen3.5 9B |
|---|---|---|
| GPQA Diamond | 85.7% | 81.7% |
FAQ
Is Grok 4 Fast Reasoning better than Qwen3.5 9B?
Qwen3.5 9B scores 20.5 on the Respan Index (#115), ahead of Grok 4 Fast Reasoning at 20.4 (#116). Grok 4 Fast Reasoning leads on 1 of the 1 benchmarks both report.
Which has the larger context window?
Grok 4 Fast Reasoning accepts 2M tokens and Qwen3.5 9B 262K tokens.