LongCat Flash Chat vs Qwen3.5 4B
| Spec | LongCat Flash Chat | Qwen3.5 4B |
|---|---|---|
| Respan Index | 16.8 (#138) | 17.3 (#136) |
| Blended price per 1M | - | $0.048 |
| Context window | 128K | 262K |
| Input / output per 1M | - | $0.04 / $0.07 |
| Max output | - | - |
| Input | text | text, vision, video |
| Released | 2025-09-01 | 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 | LongCat Flash Chat | Qwen3.5 4B |
|---|---|---|
| Coding | 3.6 LongCat Flash Chat | 1.6 Qwen3.5 4B |
| Agents | 12.0* LongCat Flash Chat | 18.7 Qwen3.5 4B |
| Reasoning | 19.1 LongCat Flash Chat | 20.1 Qwen3.5 4B |
| Knowledge & language | 14.0 LongCat Flash Chat | 9.1 Qwen3.5 4B |
| Human preference | 45.0 LongCat Flash Chat | 41.6* Qwen3.5 4B |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
Qwen3.5 4B leads on 2 of the 3 benchmarks both report. Higher is better. Each score links to where it was published.
FAQ
Is LongCat Flash Chat better than Qwen3.5 4B?
Qwen3.5 4B scores 17.3 on the Respan Index (#136), ahead of LongCat Flash Chat at 16.8 (#138). Qwen3.5 4B leads on 2 of the 3 benchmarks both report.
Which has the larger context window?
LongCat Flash Chat accepts 128K tokens and Qwen3.5 4B 262K tokens.