GPT-5.1 (high) vs GPT-5.5 (xhigh)
For product management work, compared on the PM Index.
- GPT-5.5 (xhigh) leads on the PM Index (62.9 vs 48.1).
- GPT-5.1 (high) is cheaper ($3.44 vs $11.25 per 1M tokens).
- GPT-5.1 (high) is faster (139 vs 64 tok/s).
| Metric | GPT-5.1 (high) | GPT-5.5 (xhigh) |
|---|---|---|
| PM Index | 48.1 | 62.9 |
| AA Intelligence | 47.7 | 60.2 |
| AA Coding | 44.7 | 59.1 |
| AA Agentic | 51.3 | 74.1 |
| Blended $/1M | $3.44 | $11.25 |
| Output tok/s | 139 | 64 |