GPT-5 nano scores 17.3 on the Respan Index (#109), ahead of Qwen3.5 9B at 17.2 (#110). GPT-5 nano leads on 2 of the 3 benchmarks both report. GPT-5 nano has the larger context window (400K tokens).
| Benchmark | GPT-5 nano | Qwen3.5 9B |
|---|---|---|
| Chess Puzzles (Epoch AI) | 27% | 12% |
| GPQA Diamond | 69.4% | 81.7% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 81.1% | 61.7% |
Higher is better. Each score links to where it was published.
* Estimated: no published scores in that category. How the Respan Index works