GPT-6 Sol vs GPT-5.6 Sol
GPT-6 Sol (OpenAI) and GPT-5.6 Sol (OpenAI) compared on price, context window, speed and independent benchmarks. GPT-6 Sol both scores higher on the Artificial Analysis Intelligence Index (47.5 vs 47) and is cheaper on a blended basis — 2.0× less than GPT-5.6 Sol.
| GPT-6 Sol | GPT-5.6 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input $/1M | $2.00 | $4.00 |
| Output $/1M | $10.0 | $20.0 |
| Blended $/1M (3:1) | $4.00 | $8.00 |
| Cached input $/1M | $0.20 | $0.40 |
| Context window | 1.1M | 1.1M |
| Knowledge cutoff | 2026-04 | 2026-02 |
| License | proprietary | proprietary |
| Speed (tok/s) | 107 | 58 |
| Artificial Analysis Intelligence Index | 47.5 | 47 |
| LMArena Elo | — | 1455 |
| GPQA Diamond | — | 94.1% |
| Humanity's Last Exam | 47.9% | 49.5% |