GPT-5.6 Sol vs Grok 4.6
GPT-5.6 Sol (OpenAI) and Grok 4.6 (xAI) compared on price, context window, speed and independent benchmarks. GPT-5.6 Sol scores higher on the Artificial Analysis Intelligence Index (60.9 vs 60.9), while Grok 4.6 is 2.7× cheaper on a blended basis. Pick GPT-5.6 Sol for the hardest tasks and Grok 4.6 when cost dominates.
| GPT-5.6 Sol | Grok 4.6 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Input $/1M | $4.00 | $2.00 |
| Output $/1M | $20.0 | $6.00 |
| Blended $/1M (3:1) | $8.00 | $3.00 |
| Cached input $/1M | $0.40 | $0.50 |
| Context window | 1.1M | 500K |
| Knowledge cutoff | 2026-02 | 2026-02 |
| License | proprietary | proprietary |
| Speed (tok/s) | 81 | 60 |
| Artificial Analysis Intelligence Index | 60.9 | 60.9 |
| LMArena Elo | 1455 | 1444 |
| GPQA Diamond | 94.1% | 94.9% |
| Humanity's Last Exam | 49.5% | 42.9% |