Claude Opus 4 and Qwen3.5-Plus tie on the Respan Index at 20.0. Qwen3.5-Plus leads on 2 of the 2 benchmarks both report. Qwen3.5-Plus is 33x cheaper per token at list price. Qwen3.5-Plus has the larger context window (1M tokens).
| Benchmark | Claude Opus 4 | Qwen3.5-Plus |
|---|---|---|
| GPQA Diamond | 76.3% | 84.8% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 64.4% | 86.7% |
Higher is better. Each score links to where it was published.
* Estimated: no published scores in that category. How the Respan Index works