Claude Sonnet 4 vs Qwen3.5 9B
| Spec | Claude Sonnet 4 | Qwen3.5 9B |
|---|---|---|
| Respan Index | 20.7 (#113) | 20.5 (#115) |
| Blended price per 1M | - | $0.1 |
| Context window | 200K | 262K |
| Input / output per 1M | - | $0.09 / $0.13 |
| Max output | 64K | - |
| Input | text, vision | text, vision, video |
| Released | 2025-05-22 | 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 | Claude Sonnet 4 | Qwen3.5 9B |
|---|---|---|
| Coding | 8.4 Claude Sonnet 4 | 2.8 Qwen3.5 9B |
| Agents | 17.6 Claude Sonnet 4 | 23.0 Qwen3.5 9B |
| Reasoning | 22.6 Claude Sonnet 4 | 23.4 Qwen3.5 9B |
| Knowledge & language | 17.2* Claude Sonnet 4 | 14.6 Qwen3.5 9B |
| Human preference | 45.6 Claude Sonnet 4 | 44.6* Qwen3.5 9B |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
They split the 2 benchmarks both report evenly. Higher is better. Each score links to where it was published.
| Benchmark | Claude Sonnet 4 | Qwen3.5 9B |
|---|---|---|
| GPQA Diamond | 79.2% | 81.7% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 71.1% | 61.7% |
FAQ
Is Claude Sonnet 4 better than Qwen3.5 9B?
Claude Sonnet 4 scores 20.7 on the Respan Index (#113), ahead of Qwen3.5 9B at 20.5 (#115). They split the 2 benchmarks both report evenly.
Which has the larger context window?
Claude Sonnet 4 accepts 200K tokens and Qwen3.5 9B 262K tokens.